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email Brittany White, Pharm D at
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Internal Medicine
PGY1 Residency Program Director
Chief Clinical Pharmacist, Internal Medicine
Dr. White received her Doctor of Pharmacy Degree from the University of Tennessee Health Science Center in 2012 and completed her ASHP-accredited Pharmacy Residency at Blount Memorial Hospital in Maryville, TN in 2013. Her primary practice area is Internal Medicine and she holds Board Certifications in Pharmacotherapy and Anticoagulation specialties. Dr. White serves as an educator for pharmacy students and residents on Internal Medicine rotations, and also contributes to medical resident education as a faculty member of the University of Tennessee College of Medicine at Erlanger. Her daily practice involves rounding with the Academic Internal Medicine service, working to improve patient care in both acute and chronic disease state management. In her free time, Dr. White enjoys reading novels, traveling, art, and spending time with her family.
Pharmacy Operations Manager
Dr. Harris received a Bachelor of Arts degree from the University of Tennessee in 2008 then continued her education at the University of Tennessee Health Science Center, obtaining her Doctor of Pharmacy degree in 2013. While at UTHSC, Dr. Harris was one of the first graduates in the Doctor of Pharmacy/Master of Business Administration dual-degree program done in conjunction with the Fogelman College of Business at the University of Memphis. She completed an ASHP-accredited PGY1 Pharmacy Residency at the VA Tennessee Valley Healthcare System in Nashville, Tennessee in 2014 and was the inaugural PGY2 Cardiology Pharmacy Resident at VA TVHS. Upon completion of her PGY2, Dr. Harris accepted a position as Erlanger’s Cardiology Clinical Pharmacy Specialist in late 2015. She obtained board certification in pharmacotherapy in 2014, followed by board certification in cardiology in 2019. She was honored as the External Preceptor of the Year for South College of Pharmacy for the 2018-19 academic year. Dr. Harris has served as the Pharmacy Operations Manager for Erlanger since 2022 and is the preceptor for the longitudinal hospital practice, management, and leadership rotations of the PGY1 residency program. She volunteers with the Junior League of Chattanooga and is a Past-President of the Board of Directors. She has a strong interest in leadership and leadership development and was a member of the 2020-2021 class of Leadership Chattanooga through the Chattanooga Chamber of Commerce and the 2021 inaugural cohort of Erlanger’s Emerging Leaders Program. In her free time, she enjoys spending time with her husband and son, cheering on the Tennessee Vols, reading, and spending time at the lake or beach. Dr. Harris served as the PGY1 Residency Director at Erlanger from 2018-2023.
Drug Diversion/Medication Safety Specialist
Dr. Ashley M. Williams earned her Doctor of Pharmacy degree from Florida Agricultural & Mechanical University College of Pharmacy & Pharmaceutical Sciences in 2012. She went on to complete an MBA with a concentration in Health Services Administration from Strayer University in 2015. Following her PharmD, Dr. Williams spent nine years as a retail pharmacy manager before transitioning to hospital pharmacy in November 2021. She currently serves as the Drug Diversion/Medication Safety Specialist, where she plays an active role on the Medication Safety Committee, the Diversion Oversight Committee, and several other interdisciplinary teams. In 2025, she earned the ASHP Pharmacy Accreditation & Regulatory Certificate, further strengthening her expertise in compliance and patient safety. Outside of her professional responsibilities, Dr. Williams enjoys traveling, exploring new restaurants, attending concerts, and spending quality time with her two daughters.
Critical Care
Medical and Neuroscience Critical Care
PGY2 Critical Care Residency Program Director
Dr. Tia Collier is a board-certified critical care pharmacist currently practicing as a Medical and Neuroscience Intensive Care Unit Clinical Pharmacy Specialist where she serves as a core preceptor for both PGY1s and the PGY2 Critical Care Pharmacy Resident at Erlanger Baroness Hospital. Dr. Collier received her Doctor of Pharmacy from The University of Mississippi School of Pharmacy in 2017 and completed an ASHP-accredited PGY1 Pharmacy Practice Residency at The University of Mississippi Medical Center in Jackson, MS in 2018. She completed an ASHP-accredited PGY2 Critical Care Residency at Baylor University Medical Center in Dallas, TX in 2019 and then worked as the Medical/Surgical Intensive Care Unit Clinical Pharmacist and PGY2 Critical Care Residency Program Director at UNC Health REX for over 5 years. Dr. Collier serves as an integral part of many hospital committees and is an active member of the Society of Critical Care Medicine (SCCM) and American College of Clinical Pharmacy (ACCP) Care PRN group. Her areas of interest include sedation, analgesia, and delirium management in the critically ill, infectious diseases management, toxicology, alcohol withdrawal, extracorporeal circulation, and student/resident development. In her spare time, Dr. Collier enjoys traveling, scuba diving, and spending time with her family and cat (Tori).
Surgical/Trauma Critical Care, Nutrition Support
Dr. Wilson is board certified in critical care and practices as the Surgical/Trauma Critical Care Specialist and Nutrition Support clinical pharmacist at Erlanger. After receiving his Doctor of Pharmacy from the University of Tennessee Health Science Center in 2019, he completed an ASHP-accredited PGY1 Pharmacy Practice residency at Erlanger Health System in Chattanooga, TN. He went on to complete an ASHP-accredited PGY2 Critical Care/Nutrition Support pharmacy residency at Regional One Health in Memphis, TN. Dr. Willson serves as a core preceptor for both for both the PGY1 and PGY2 Critical Care pharmacy residency programs, as well as a pharmacy student preceptor for the University of Tennessee and Union University College of Pharmacy. Additionally, he serves on many hospital committees including Critical Care Committee, ECMO Committee, and Trauma Committee. His areas of interest include traumatic brain injury and nutrition support. In his free time, Dr. Wilson loves traveling, competing in triathlons, and spending time with his family.
ICU Float
Chief Clinical Pharmacist, ICU/Emergency Department
Dr. Chastang currently serves in a leadership role as Chief Clinical Pharmacist for the Critical Care team. As part of her role, she spends about 50% of her time providing clinical float coverage across all critical care services lines. She offers a wealth of knowledge and experience to residents, having completed her Doctor of Pharmacy degree from the University of Florida College of Pharmacy in 2014, PGY1 Pharmacy Residency at UF Health Shands Hospital in 2015, and PGY2 Critical Care Pharmacy Residency at the University of Texas MD Anderson Cancer Center in 2016. She has formerly served as a clinical pharmacy specialist and primary preceptor in the MICU, SICU, TICU, and CCU/CVICU. Dr. Chastang is passionate about process improvement and medication safety. Other interest areas include management of the critically ill surgical patient, diabetic ketoacidosis, nutrition support in critical illness, and de-resuscitation management strategies. Outside of pharmacy, she is passionate about real food and holistic agriculture. Together with her husband, she is building a regenerative farm.
Cardiovascular Critical Care
Dr. Kelci Dalton received her Doctor of Pharmacy Degree from Lipscomb University College of Pharmacy in 2019. After graduation Dr. Dalton went on to complete her PGY1 pharmacy practice residency at the VA Tennessee Valley Healthcare System and PGY2 in Cardiology residency at Baylor St. Lukes Medical Center in Houston, Tx. Upon completion of her PGY2 Dr. Dalton accepted a position in Internal Medicine before returning to Baylor St. Luke's Medical Center as the cardiothoracic and medical cardiology clinical pharmacy specialist. In 2022 she went on to serve as the RPD for the PGY2 Cardiology residency before coming to Erlanger healthcare system in 2025. Dr. Dalton is a board-certified cardiology pharmacist and serves as the cardiovascular critical care clinical pharmacist and rounds with both the Cardiothoracic Surgery and Academic Cardiology teams and precepts both PGY1 and PGY2 Critical Care residents. In her free time, she enjoys traveling, hiking and spending time with her family.
Emergency Medicine
Dr. Galyon received his Doctor of Pharmacy degree, as well as his certificate in Healthcare Informatics, from Lipscomb University College of Pharmacy in 2015. He then completed an ASHP-accredited residency in pharmacy practice at Erlanger Health System in 2016. Dr. Galyon is a Board Certified Pharmacotherapy Specialist and Emergency Medicine Pharmacist. He has served as a staff pharmacist, and also chief IV room pharmacist at the Erlanger Main Campus. His is currently an emergency department clinical pharmacist for Erlanger Health System. His areas of interest include emergency medicine, critical care medicine, health care informatics, toxicology, and standardization of services. Dr. Galyon was honored as the 2022 Erlanger Pharmacy Residency Preceptor of the Year.
Dr. Brown earned a Bachelor of Science in Biology from the University of Tennessee at Martin and her Doctor of Pharmacy degree from Union University College of Pharmacy in 2020. She completed an ASHP-accredited PGY-1 Pharmacy Practice residency at Erlanger Health System in Chattanooga, TN followed by an ASHP-accredited PGY-2 Critical Care residency at Johnson City Medical Center. Dr. Brown is dual board certified in pharmacotherapy and critical care, and currently practices as an emergency medicine clinical pharmacist. In her free time, she enjoys spending time with her puppy, exploring Chattanooga, and watching hockey.
Infectious Diseases
Dr. White serves as an Infectious Diseases Pharmacy Specialist and an adjunct faculty member at the University of Tennessee College of Pharmacy. He completed his Bachelors degree in Biology at Tennessee Tech University in Cookeville, TN and then received his Doctor of Pharmacy degree from the University of Tennessee Health Science Center. After pharmacy school, Dr. White completed a two-year ASHP-accredited Pharmacotherapy residency at the University of Tennessee Medical Center and UT College of Pharmacy in Knoxville with a focus in Academia and Infectious Diseases. Dr. White provides high level pharmaceutical care for an Infectious Diseases consult service while also running a progressive Antimicrobial Stewardship Program. He is an active member in the Tennessee Society of Health-Systems Pharmacy and the Society of Infectious Diseases Pharmacists. Personal interests include hiking, traveling and spending time with his family.
Dr. Thelen serves as an Infectious Diseases clinical pharmacy specialist. After receiving his Doctor of Pharmacy degree from the University of Georgia College of Pharmacy in 2022, he then completed an ASHP-accredited pharmacy residency at Prisma Health-Upstate in 2023, and subsequently an ASHP-accredited PGY-2 infectious diseases pharmacy residency at Erlanger Health System in 2024. Alongside being an active member of the Society of Infectious Diseases Pharmacists, Dr. Thelen provides personalized, evidence-based pharmaceutical care for an infectious diseases consult service while also working within a progressive antimicrobial stewardship program. Personal interests include golfing, skateboarding, exploring Chattanooga, and spending time with his cat (Oreo).
Medicine
Family Medicine
Dr. Bradford received a Bachelor of Science degree from Clemson University and then obtained her Doctor of Pharmacy degree from Union University in Jackson, Tennessee. She then completed an ASHP-accredited PGY1 Pharmacy Residency at Jackson-Madison County General Hospital in Jackson, Tennessee. She currently practices in collaboration with the University of Tennessee Family Medicine academic teaching service in both the acute care and primary care settings, where she serves as a preceptor for pharmacy students and residents. She contributes to medical resident and student education as a faculty member with the Family Medicine Department of the University of Tennessee College of Medicine-Chattanooga. In her free time, she enjoys baking, being outside and spending time with her husband and three children.
Inpatient Internal Medicine
Dr. Goodwin received a Bachelor of Science Degree from Virginia Tech and earned her Doctor of Pharmacy degree from The University of Tennessee College of Pharmacy in 2015. She then completed an ASHP- accredited PGY-1 general practice residency followed by a PGY-2 specializing in Internal Medicine at The University of Tennessee Medical Center in Knoxville, Tennessee. Dr. Goodwin is a Board Certified Pharmacotherapy Specialist. She currently practices with the Erlanger Internal Medicine Academic Teaching Service. Personal interests include traveling, trying new restaurants and spending time with her family.
UT Internal Medicine Clinic
Dr. Hollums received a Bachelor of Science in Biochemistry from the University of Tennessee at Chattanooga in 2009. She obtained her Doctor of Pharmacy degree from the University of Tennessee Health Science Center (UTHSC) in 2019. She completed an ASHP-accredited PGY1 Pharmacy Residency and PGY2 specialty residency in Internal Medicine at the Memphis VA Medical Center in Memphis, Tennessee. During her residency she was also awarded a teaching certificate from the UTHSC College of Pharmacy. Dr. Hollums accepted her current position as a Clinical Pharmacy Specialist and moved to Chattanooga post-residency in 2021. She practices in collaboration with the University of Tennessee Internal Medicine academic teaching service in the primary care clinic. Outside of her career, Dr. Hollums enjoys spending quality time with friends and family, spoiling her three pups, exercising, cooking, traveling and being outdoors.
Erlanger Community Health Centers
Dr. Lyda graduated from Mississippi State University with a Bachelor of Science in Biology in 2016 and then received her Doctor of Pharmacy degree from the University of Tennessee Health Science Center (UTHSC) College of Pharmacy in 2020. She completed an ASHP-accredited PGY1 Pharmacy Residency at DCH Regional Medical Center in Tuscaloosa, AL in 2021 followed by an ASHP-accredited PGY2 Ambulatory Care Residency at Regional One Health in Memphis, TN in 2022. Prior to accepting her current position in 2024, she practiced as an Ambulatory Care Pharmacist at Regional One Health where she helped establish outpatient-based heart failure and transitions of care pharmacy services. Dr. Lyda is a Board Certified Ambulatory Care Pharmacist practicing in the primary care setting within the Erlanger Community Health Centers. In her free time, she enjoys traveling, trying new restaurants, and spending time with her husband and two dachshunds, Poppy and Sally.
Inpatient Internal Medicine
Dr. Odum earned a Bachelor of Science from Liberty University in 2013 and a Doctor of Pharmacy from Campbell University in 2023. She completed an ASHP-accredited PGY-1 residency in acute care and a PGY-2 residency in Internal Medicine at Cape Fear Valley Medical Center in Fayetteville, North Carolina. Dr. Odum is a Board-Certified Pharmacotherapy Specialist and currently practices with the Erlanger Internal Medicine Academic Teaching Service. Outside of pharmacy, she enjoys spending time with her dog, Teddy, and exploring the outdoors through hiking, kayaking, and fishing.
Internal Medicine
Dr. White received her Doctor of Pharmacy Degree from the University of Tennessee Health Science Center in 2012 and completed her ASHP-accredited Pharmacy Residency at Blount Memorial Hospital in Maryville, TN in 2013. Her primary practice area is Internal Medicine and she holds Board Certifications in Pharmacotherapy and Anticoagulation specialties. Dr. White serves as an educator for pharmacy students and residents on Internal Medicine rotations, and also contributes to medical resident education as a faculty member of the University of Tennessee College of Medicine at Erlanger. Her daily practice involves rounding with the Academic Internal Medicine service, working to improve patient care in both acute and chronic disease state management. In her free time, Dr. White enjoys reading novels, traveling, art, and spending time with her family.
Trauma Step Down
Dr. Settles earned a Bachelor of Science in Microbiology from East Tennessee State University in 2017 and his Doctor of Pharmacy degree from Auburn University Harrison College of Pharmacy in 2021. He completed an ASHP-accredited PGY1 pharmacy residency at Parkridge Health System in Chattanooga, TN in 2022. He has been with Erlanger Health System since 2022, serving as a staff and decentralized pharmacist. Dr. Settles currently serves as the Trauma Step Down clinical pharmacist. Personal interests include golfing, traveling, and spending time with his family and friends.
Oncology
Chief Clinical Pharmacist, Erlanger Infusion Centers
Dr. Turner received her Doctor of Pharmacy degree from Bill Gatton College of Pharmacy in 2017 and completed her ASHP-accredited PGY-1 pharmacy practice residency at Erlanger Health System in 2018. Dr. Turner is a Board-Certified Pharmacotherapy Specialist who practices as the Chief Clinical Pharmacist for Erlanger’s infusion centers. Her areas of interest include oncology, hematology, immunotherapy, and USP 797/800 compliance.
Dr. Dertien serves as a clinical pharmacist in Erlanger’s infusion centers verifying and compounding chemotherapies and biologic specialty therapies for inpatients and outpatients. He completed his Bachelor’s degree in pharmaceutical sciences at the University of Mississippi, followed by his Doctor of Pharmacy degree in 2021. After pharmacy school, Dr. Dertien completed his ASHP-accredited PGY-1 pharmacy practice residency at CHI Memorial in Chattanooga, TN, and has been practicing at Erlanger in his current role since 2022. At this time, he serves as a preceptor-in-training for the elective oncology rotation in the Erlanger residency program. In his free time, Dr. Dertien enjoys listening to/playing/writing music, cooking, and spending time outdoors with his fiancé and pets.
Dr. Mercy John-Thomas earned her bachelor's degree in Biochemistry from David Lipscomb University and her Doctor of Pharmacy from the University of Charleston School of Pharmacy. She began her career in retail pharmacy, where she worked for nine years as a manager before transitioning to hospital pharmacy in 2019 as a staff pharmacist. She currently practices as a clinical pharmacist at the UT Erlanger Women's Oncology Infusion Center, collaborating with oncology providers to develop tailored treatment plans for patients. She is an active member of Tennessee Oncology Pharmacists Association and serves on the Advisory board of Continuing Professional Development at UTHSC. Outside of work she enjoys spending time with family and friends, reading, trying to new restaurants, and traveling.
Pediatrics
Dr. Davis completed her Doctor of Pharmacy degree at the University of Georgia. She completed a PGY1 residency at the University of Georgia/ St. Joseph’s Candler Health System in Savannah, GA. She then went on to West Virginia University to complete a PGY2 specialty residency in Pediatrics, where she stayed on as a pediatric float. Dr. Davis is currently serving as the clinical pharmacist for the Pediatric Hematology/ Oncology service at the Children’s Hospital at Erlanger.
General Pediatrics
Chief Clinical Pharmacist, Pediatrics
Dr. Gerwin received her BS in Biology from Birmingham Southern College in 2002 and then her Doctor of Pharmacy degree from Samford University, McWhorter School of Pharmacy in 2009. She was an active member of Rho Chi and Phi Lambda Sigma with a special interest in vaccine advocacy. After graduation, she completed an ASHP-accredited PGY1 pharmacy practice residency at the University of California San Francisco School of Pharmacy, Hospitals and Clinics in 2010. During her residency she was also awarded a teaching certificate from the UCSF School of Pharmacy. She is a Board Certified Pediatric Pharmacy Specialist whose interests lie in pediatric critical care, cystic fibrosis, and pediatric anti-microbial stewardship. She has recently pioneered a clinical pharmacist and technician position in the Pediatric Pulmonology clinic with grants awarded by the Cystic Fibrosis Foundation. She is a lead member of the venous thromboembolism committee for the Children’s Hospital at Erlanger. She also serves as a stewardship liaison for the Children’s Hospital and is an active member of the Pediatric Pharmacy, Nutrition, and Therapeutics committee.
Neonatology
Dr. Hughes graduated from the University of Tennessee with a Bachelor of Science degree in 2008. She then completed her Doctor of Pharmacy Degree at the University of Tennessee Health Science Center in 2012. She went on to complete a PGY1 Residency with a pediatrics emphasis at The Studer Family Children’s Hospital at Sacred Heart in Pensacola, Florida. Following completion of residency, she worked as a clinical staff pharmacist at Sacred Heart and as a staff pharmacist for the Children’s Hospital at Erlanger before transitioning into her current role of clinical pharmacist for the Neonatal Intensive Care Unit in 2017. She is a Board Certified Pediatric Pharmacy Specialist whose interests include neonatal critical care, medication safety, and antimicrobial stewardship.
Pediatric Emergency Department
Dr. Raker received her Doctor of Pharmacy from Ohio Northern University College of Pharmacy in 2020. After graduating, she moved to Savannah, Georgia to complete a PGY-1 residency in Pharmacy Practice at Memorial Health University Medical Center. After completing residency, she stayed on to work as an inpatient clinical pharmacist at the Children’s Hospital of Savannah, with rotating coverage of Pediatric ICU, Neonatal ICU, General Pediatrics, as well as pediatric code and trauma teams. In 2023, Dr. Raker joined Erlanger Pediatric’s team as a clinical pharmacist in the Pediatric Emergency Department. In her free time, she enjoys raising two little kiddos, sewing, and renovating her house.
Dr. Padron received her Doctor of Pharmacy from the University of Georgia College of Pharmacy in 2021 where she completed her clinical rotations in Savannah, Georgia. After pharmacy school, she completed an ASHP-accredited PGY1 Pharmacy Practice at Le Bonheur Children’s Hospital in Memphis, Tennessee. She went on to work for 2 years as a Maternal/Child Clinical Pharmacist at the University of Kansas Health System in Kansas City, Kansas where she covered many areas including the Pediatric ICU, Neonatal ICU, general pediatrics, and maternal medicine units. In 2024, she joined Erlanger as a clinical pharmacist in the Pediatric Emergency Room. Outside of work, she enjoys spending time with family, cheering on the Georgia Bulldogs and playing with her two dogs.