Home » Our Practice » Meet our Providers

Meet our Providers

Physician Assistant in Charleston, SC

Rebecca Zerwick Johnson MPAS, PA-C

Rebecca grew up in Denver, Colorado and moved to Charleston to attend MUSC in 2004. She received her Master’s degree in Physician Assistant studies in 2006. Since graduation, Rebecca has worked five years in rural medicine which included dermatology, another five years in Emergency medicine and three years with a weight loss clinic. She joined Sweetgrass Plastic Surgery in January of 2015 to help with new patient consults, follow up appointments, laser treatments, small dermatologic procedures, injectables and the Juliet laser. Rebecca married a South Carolinian, has a sweet active two year old son and just gave birth to her second son in July 2016. Rebecca loves being outside and out on the water, leads boot camp at 5am, and has led many medical mission teams.



Nurse Anesthetist in Charleston, SC

Mike Donovan, DNAP, CRNA

Mike Donovan is a Certified Registered Nurse Anesthetist with over 14 years of experience providing safe, cost-effective, high quality anesthesia services in the Charleston and surrounding areas. Mike developed a passion for the cosmetic surgery patient population early in his career and continues to specialize in outpatient and office-based anesthesia. After working with many of the plastic surgeons around Charleston, Mike began working with Dr. Schimpf to build Sweetgrass Plastic Surgery into one of the busiest and fastest growing practices in the country. In 2016, Mike started Ketamine Infusion Specialists of Charleston and is partnering with Sweetgrass Plastic Surgery to provide intravenous infusion services for those suffering with various mental health disorders. Mike has attended the University of Georgia, The Citadel, Medical University of South Carolina, the University of South Carolina, and completed his Doctorate in Nurse Anesthesia Practice (DNAP) degree in August 2018 from Midwestern University. Mike remains an active board member with the South Carolina Association of Nurse Anesthetists (S.C.A.N.A.) and active in the American Association of Nurse Anesthetists (AANA). He currently resides on Daniel Island with his family.

Alexis Harley, NCC, LPCA

Alexis is a National Certified Counselor as well as a Licensed Professional Counselor Associate for South Carolina. She is an Ohio native and has called Charleston her home since 2008. She received her Bachelors in Psychology from the University of South Carolina and graduated Summa Cum Laude with a Masters in Clinical Mental Health Counseling from Walden University.

Alexis has a passion for helping individuals suffering from Depression, Bipolar Disorder, and Post Traumatic Stress Disorder. Her desire to help those in crises situations has led her to become knowledgeable in alternative treatments when medication and psychotherapy alone did not provide the desired outcome. Through ketamine infusions, Alexis works with the patient to engage the resurfacing of the unconscious mind, process insights, and discover ways to reframe former beliefs, experiences, and perceptions. Working towards the development of a healthy thought process, individuals are supported by her in moving forward with their lives as happier and healthier individuals.

Tim McAdams, CRNA, MSNA

Tim McAdams is a Certified Registered Nurse Anesthetist who has practiced in a number of office-based surgery centers and hospitals in the Lowcountry. He attended the University of Georgia and graduated from the Medical University of South Carolina in 2005 and has lived in Charleston ever since. Tim brings years of experience to our office and is committed to the best and safest anesthesia for all of our patients. He lives on James Island with his wife and 2 children.





James (Hal) Mahaffee, CRNA

James (Hal) Mahaffee is a Certified Registered Nurse Anesthetist with 5 years of experience providing safe, cost-effective and high-quality anesthesia services in Charleston. Hal has been practicing anesthesia to patients of all ages, neonates to geriatrics. He moved to Charleston to attend the Medical University of South Carolina Anesthesia for Nurses Program after 5 years of experience as a Registered Nurse in a high volume, high acuity Cardiovascular Intensive Care Unit. He was asked to stay and work in Charleston and has since graduated with a Master’s of Science in Nurse Anesthesia. Growing up in a small town in South Georgia, Charleston has been a city of great opportunity and advancement for his medical career. He has had the opportunity to expand from a hospital-based anesthesia practice to an office-based anesthesia practice through REM Anesthesia Services. He is excited to be a part of Sweetgrass Plastic Surgery and help patients have a safe and comfortable anesthesia experience. He resides in West Ashley with his fiance and their two dogs.

Jessica McBride, Nurse Practitioner

Jessica (Jess) McBride is a Board Certified Family Nurse Practitioner with over six years of NP experience. Jess grew up in northern New Jersey and received her Master’s of Science in Nursing at Case Western Reserve University in Cleveland, Ohio. Prior to joining Sweetgrass Plastic Surgery in June, Jess has professional and clinic experience working in family medicine in Charleston, The Hospital of the University of Pennsylvania, Cleveland Clinic, University Hospitals Cleveland Medical Center and The Morgenstern Center for Orbital and Facial Plastic Surgery. She has also worked as a Family Nurse Practitioner in Hawaii as well as a holistic rotation in Copenhagen, Denmark.

In her spare time, Jess loves to travel with her husband, Sean, and they can often be found on the boat, surfing or with their Boykin Spaniel, Koa.

Jess brings an exorbitant amount of energy to all her patients and is a welcome addition to Sweetgrass Plastic Surgery.

Lauren Lewis, Certified Nurse Practitioner

Lauren graduated with her Masters in Nursing from the University of North Carolina Wilmington and moved to Charleston to practice as a Certified Nurse Practitioner. She also holds a bachelor’s degree in Exercise Physiology and loves the active lifestyle enjoyed by many on the South Carolina coast. She is passionate about helping people feel and look their best and honored to work alongside the medical team at Sweetgrass Plastic Surgery with the goal of improving patients’ quality of life. Lauren currently resides in Johns Island with her dog, Nymeria, and is an avid runner, dance instructor, and outdoor enthusiast.


LeeAnn DePriest, DNP, NP-C

LeeAnn is a nationally board certified and state licensed Family Nurse Practitioner. She obtained a nursing degree from Bob Jones University in 2012 and then attended The University of Tennessee Health Science Center where she earned a Doctorate of Nursing Practice in 2016. The following year, LeeAnn opened a successful medical spa business in Tennessee where she offered a variety of injectable and cosmetic treatments. She is originally from South Carolina and was thrilled to have the opportunity to move back to Charleston in 2019 with her husband and toy maltipoo. She has a passion for clients to look and feel their best!