Meet our team
Staff • Dermatology Associates of Oak Ridge, P.C.
All our professionals at Dermatology Associates of Oak Ridge, PC maintain the highest levels of accreditation and pursue ongoing education to stay abreast of the latest trends in dermatology.
Leland Smith, M.D., FAAD
Medical School:
University of Tennessee College of Medicine, Memphis; 2005
Internship:
University of Tennessee Health Science Center, 2006
Dermatology Residency:
University of Tennessee Health Science Center, 2009
Board Certification:
Board Certified by the American Board of Dermatology, 2009
Professional Organizations:
- Fellow of the American Board of Dermatology
- American Medical Association
- Roane-Anderson County Medical Society
- Tennessee Dermatological Society
- East Tennessee Dermatological Society
- Tennessee Medical Association
Katherine Kerchner, M.D., FAAD
Medical School:
University of Missouri-Columbia; 2005
Internship:
University of Tennessee Medical Center, Knoxville; 2006
Dermatology Residency:
Wake Forest University, Winston-Salem, NC; 2009
Mohs Micrographic Surgery Fellowship:
Wake Forest University, Winston-Salem, NC; 2010
Board Certification:
- Board Certified by the American Board of Dermatology, 2009
- Diplomate of the American Board of Dermatology
- Founding Member of the American Board of Medical Specialties with a certification in Micrographic Dermatological Surgery
Professional Organizations:
- Fellow of the American Academy of Dermatology
- Fellow of the American College of Mohs Surgery
- Roane-Anderson County Medical Society
- Tennessee Dermatological Society
- East Tennessee Dermatological Society
- Tennessee Medical Association
- Women's Dermatologic Society
- Diplomate of the American Board of Dermatology
Evgeniya T. Mohammed, M.D., FAAD
Medical School:
East Tennessee State University Quillen College of Medicine Johnson City, 2017
Internship:
University of Tennessee Health Science Center Memphis, 2018
Dermatology Residency:
University of Tennessee Health Science Center Memphis, 2021
Board Certification:
Board Certified by the American Board of Dermatology, 2021
Professional Organizations:
- Fellow of the American Academy of Dermatology
- American Board of Dermatology
- American Medical Association
- Tennessee Medical Association
- Tennessee Dermatological Society
- American Academy of Cosmetic Surgery
- American Society for Dermatologic Surgery
Andrew Morgan, PA-C, MPAS
Master of Physician Assistant Studies:
University of Nebraska College of Medicine, Omaha, NE
Dermatology Specialization, Internship at Mayo Dept. of Dermatology
Honor Graduate, 1999
Military Physician Assistant Program:
University of Texas Health Science Center, San Antonio, TX
Bachelor of Science in Physician Assistant Studies
Internship at Fort Riley Kansas
Honor Graduate 1998
Undergraduate:
Athens State College, Athens, AL; BS in Education; Honor Graduate, 1993
Professional Certifications:
- NCCPA National Board Certification, Physician Assistant, 1998; recertified 2003, 2009
- NCCPA National Board Certification in Surgery, 1998
Professional Associations:
- American Academy of Physician Assistants
- Society of Dermatology Physician Assistants
- Society of Army Physician Assistants
- Tennessee Academy of Physician Assistants
- National Psoriasis Foundation
Additional:
- Associate Professor, Lincoln Memorial University-Debusk College of Osteopathic Medicine, PA studies
- Clinical Instructor, University of Tennessee Health Science Center, College of Medicine, PA studies
- Served 22 years USAR (United States Army Reserve), retired 2010 after multiple deployments
Jerry Allen, BSN, MSN, APN-C
Master of Science in Nursing:
Master of Science in Nursing, RN, BSN, MSN, ANP-C
University of Tennessee, Knoxville, TN, 2007
Invitation to Sigma Theta Tau, International Honor Society for Nurses
Undergraduate:
Bachelor of Science in Nursing
University of Tennessee, Knoxville, TN, 2006
East Tennessee State University, Johnson City, TN
Professional Certifications:
- Certified Advanced Practice Nurse, 2008
- American Nurses Credentialing Center National Exam, Family Nurse Practitioner, 2008
- Basic Life Support Certification, 1988 - Present
- Advanced Cardiac Life Support, 2002 - Present
Professional Associations:
- American Academy of Nurse Practitioners
- American Nurses Association
- Tennessee Nurses Association
- American Diabetes Association
Derek Landon Ramsey, PA-C, MMS
Master of Medical Science:
Lincoln Memorial University- Debusk College of Medicine, Harrogate, TN
Pi Alpha Honors, 2017
Undergraduate:
Bachelor of Science in Biology: Marshall University, Huntington, WV
Magna Cum Laude, 2014
Professional Certifications:
- NCCPA National Board Certification, Physician Assistant, 2017
- SDPA Diplomate Fellow, 2020
Professional Associations:
- American Academy of Physician Assistants
- Society of Dermatology Physician Assistants
- Tennessee Academy of Physician Assistants
Additional:
- Trained at Dermatology Associates of Oak Ridge in 2017 as a student.
- Practiced Medical Dermatology in Charleston, WV from 2017-2020.
Lauren Church, PA-C
Master of Physician Assistant:
Eastern Virginia Medical School, Norfolk, VA, 2018
Undergraduate:
University of Tennessee, Knoxville, TN; B.S.E. Kinesiology, 2012
Professional Certifications:
- NCCPA National Board Certification, Physician Assistant, 2018 to present
- American Heart Association, ACLS, 2016 to present
- AHA BLS Certification, 2018 to present
Professional Associations:
- American Academy of Physician Assistants
- Society of Dermatology Physician Assistants
Kegan Reilly, PA-C, MPAS
Master of Physician Assistant:
University of Nebraska Medical Center, Ft. Sam Houston, TX
Interservice Physician Assistant Program (IPAP)
Pi Alpha Honor Graduate (GPA 3.9) 2014
Undergraduate:
United States Military Academy, West Point, NY BS in Math Sciences
Honor Graduate, 2008
Professional Certifications:
- NCCPA National Board Certification, Physician Assistant, 2014
- SDPA Diplomate Fellow, 2022
Professional Associations:
- Society of Dermatology Physician Assistants
- Pi Alpha National Honor Society IPAP Chapter
Additional:
- Served as Battalion Aeromedical Physician Assistant for the 1-501st Apache Attack Battalion, 1st Armored Division Combat Aviation Brigade, Feb. 2016 - Mar. 2019
- Flight Surgeon Course Graduate, U.S. Army Aviation Center and School, Ft. Rucker, AL, 2016
- Served as Battalion Physician Assistant - Primary Care for the 1-77th Armored Battalion, Nov. 2014 - Feb. 2016
- Served 10 years in the United States Army, including 2 deployments.
Jerrin Levy, PA-C
Master of Health Science in Physician Assistant Studies:
South College, Knoxville, TN, 2015
Undergraduate:
University of Kentucky, Lexington, KY; BS in Human Nutrition, 2012
Professional Certifications:
- NCCPA National Board Certification, Physician Assistant, 2015 to present
- AHA BLS Certification, 2013 to present
Professional Associations:
- American Academy of Physician Assistants
- Society of Dermatology Physician Assistants
Additional:
- Practiced medical and cosmetic dermatology in Greeneville, TN from December 2015 to February 2024
Emily J. Hairfield, MPH, MMS, PA-C, DMSc
May 2022
Doctor of Medical Science- Clinical
University of Lynchburg College of Health Science (Lynchburg, VA)
August 2016
Master of Medical Science Physician Assistant Studies
Lincoln Memorial University College of Osteopathic Medicine (Harrogate, TN)
May 2013
Master of Public Health (InfecIous Disease and Health EducaIon)
Virginia Polytechnic InsItute and State University (Blacksburg, VA)
May 2011
Bachelor of Science in Biological Sciences
Virginia Polytechnic InsItute and State University (Blacksburg, VA)
Professional Certifications:
- NCCPA National Board Certification, Physician Assistant, 2016
- Wilderness Medicine First Responder, 2018
- SDPA Fellow, 2022
Additional:
- Practiced in Hematology Oncology immediately out of PA school
- Practiced in Medical Dermatology and Mohs surgery for the last 3 years
with a focus on surgical Derm before transitioning to full time Mohs
here at Dermatology Associates of Oak Ridge.
Linda Clark
Laser Specialist, Electrologist
Linda Clark is a licensed and experienced
laser specialist and state licensed electrologist. She has been trained and is supervised by board-certified dermatologists on site. Linda specializes in laser hair removal, Fotofacial treatments, as well as chemical peels. She offers a variety of procedures to reduce brown spots, red spots, acne, and rosacea, as well as smooth skin texture. Linda has expertise with both the Aurora RF Fotofacial and the Polaris skin tightening systems. These systems offer a combination of energies for the most effective and comfortable solution with no downtime. Linda uses the GentleLASE 755 nm Alexandrite laser for removal of unwanted hair, microvaricosities, and red and brown spots. Special packages are available.
Call today for a consult!
Chelsea McCroskey, MSN, FNP-BC
Master of Science in Nursing:
Master of Science in Nursing, MSN, FNP-BC
Lincoln Memorial University, Harrogate, TN, 2023
Undergraduate:
Bachelor of Science in Nursing
University of Tennessee, Knoxville, TN, 2017
Professional Certifications:
- Family Nurse Practitioner, 2023
- American Nurses Credentialing Center National Exam, Family Nurse Practitioner, 2023
- Basic Life Support Certification
- Neuromodulators & Dermal Fillers – Med-Aesthetics Training Institution
Additional:
- Chelsea is a board-certified Family Nurse Practitioner focusing on aesthetic medicine. She works closely with our patients to develop a personalized approach to reach their cosmetic goals. Achieving an enhanced, natural result is Chelsea's specialty. She loves helping patients feel like the most confident version of themselves.
Michelle Dack, RN, LME
With over 26 years of experience in the healthcare industry, Michelle blends extensive medical expertise with a deep passion for skin care. As a Registered Nurse and Licensed Aesthetician she has worked in a variety of healthcare settings from the operating room to medical-surgical units before focusing exclusively on aesthetics over the past 16 years.
Michelle specializes in advanced skin care treatments and holds a range of certifications, Including: Dermaplaning, Microneedling, Microdermabrasion, Chemical Peels, HydraFacial, SkinBetter Science, and SkinScriptRx.

Michelle is committed to helping both adults and teens achieve their healthiest, most radiant skin. She has a particular passion for assisting teens with acne and other common skin challenges. Dedicated to continuous learning, she stays up-to-date with the latest skin care techniques and trends to provide the highest quality treatments. Every service is customized to address the unique needs of each client, and she places a strong emphasis on the importance of a consistent at-home skincare routine for achieving long-lasting, beautiful results beyond the treatment room.
