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Our Team: Doctors

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Elizabeth S. Christian, MD

Elizabeth S. Christian, MD is a graduate of the Medical University of South Carolina. She completed her residency in Internal Medicine from Bowman School of Medicine in Winston Salem, North Carolina, and her fellowship from The University of Alabama Medical Center in Birmingham, Alabama, in Hematology, Medical Oncology. Dr. Christian is also a member in the South Carolina Medical Association; she is a former President of the South Carolina Oncology Society and serves as a member of the Roper St. Francis Cancer Committee, Piedmont Oncology Association, and American Society of Clinical Oncology as well as other local and state professional organizations. Dr. Christian has published works in the Journal of the Reticuloendothelial Society, Journal of Immunology, American Family Physician, American Journal of Clinical Oncology, and the American Journal of Medicine.

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David M. Ellison, M.D.

David M. Ellison, MD is board certified in Internal Medicine, Medical Oncology and Hematology. A graduate of Yale University and Duke University School of Medicine, he completed his residency in Internal Medicine at Johns Hopkins Hospital and his fellowship at Duke University in Hematology/Oncology. Dr. Ellison was the MedicalDirector of Roper St. Francis Cancer Center, the Chairman of The RoperCancer Committee from 2002-2012 and served on the Board of Directors for Roper St. Francis Healthcare, as well as the Board of Directors for The Medical Society of South Carolina. He was the founding chairman of the Low Country Affiliate of the Komen for the Cure Foundation. Dr. Ellison is a past recipient of the Physician Champion Award of the Roper St. Francis Foundation. He is currently the Principal Investigator for several clinical trials of new, promising cancer drugs being conducted at CHOA.

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George F. Geils, Jr., M.D.

George F. Geils, Jr., MD is board certified in Internal Medicine, Medical Oncology and Hematology. Dr. Geils is the Medical Director for the Blood and Marrow Transplant Program for Roper St. Francis Healthcare. A graduate of the Medical University of South Carolina, he completed his residency at the University of Maryland Medical Center, and his fellowship at The University of Alabama at Birmingham in Hematology, Medical Oncology and Bone Marrow Transplantation. Dr. Geils is a member of the American Society for Blood and Marrow Transplantation, International Society of Hematotherapy and Graft Engineering, American Medical Association, American College of Physicians, American Society of Hematology, American Society of Clinical Oncology and various local and state professional organizations relating to his field. He serves as the Chairman of The Roper St. Frances Institutional Review Board, Chairman of the Roper St. Francis Pharmacy and Therapeutics Committee, and Member of the Roper Medical Executive Committee. Dr. Geils has several published works in the Journal of Clinical Oncology and the Journal of Hematotherapy. He continues his research in allogeneic stem cell transplantation, alloimmune recovery and cell-mediated graft-versus disease effect.

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James M. Orcutt, M.D.

James M. Orcutt, MD is board certified in Medical Oncology. He obtained his Doctorate of Medicine degree in 1990 from Bowman Gray School of Medicine of Wake Forest University. He then entered his internship in Internal Medicine at Carolinas Medical Center where he completed his residency in 1993. He subsequently completed his fellowship in Hematology and Medical Oncology from the Medical College of Virginia in 1996. Dr. Orcutt currently serves as the community leader and principal investigator for the Southeastern Cancer Control Consortium and Roper St. Francis Cancer Center. He also serves on the Roper St. Francis Healthcare Institutional Review Board. He has published works in Blood Journal. He is a member of the American Society of Clinical Oncology, American Society of Hematology, American College of Physicians, American Medical Association and various local and state professional organizations relating to his field.

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George P. Keogh, M.D.

George P. Keogh, MD earned his undergraduate degree in English Literature from the University of Pennsylvania in Philadelphia. He graduated from Columbia University College of Physicians and Surgeons in New York City and stayed for internship and residency in internal medicine at Columbia-Presbyterian Medical Center. He completed his fellowship in hematology and medical oncology at Duke University Medical Center in Durham, North Carolina. He is a member of The American Medical Association, American Society of Clinical Oncology and American Society of Hematology. Dr. Keogh has been published in the Journal of Clinical Oncology. Dr. Keogh joined Charleston Hematology Oncology Associates, P.A., in 2004. He is board certified in medical oncology and hematology.

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Gene B. Saylors, M.D.

Gene B. Saylors, MD is board certified in Medical Oncology and Internal Medicine. He received his Bachelor of Science in Cellular Biology from the University of Georgia. He obtained his Doctorate of Medicine degree from The University of South Carolina School of Medicine. He then entered his internship and completed his residency in Internal Medicine at the University of Alabama at Birmingham. He also completed his fellowship in Hematology and Medical Oncology while at The University of Alabama at Birmingham. Dr. Saylors holds memberships with the South Carolina Medical Association, American College of Physicians, American Society of Clinical Oncology and The American Society of Hematology. He has done extensive work with The University of Alabama at Birmingham in breast cancer and lymphoma, specifically the use of monoclonal antibodies in triple negative breast cancer, with funding by the Susan G. Komen for the Cure Foundation. Dr. Saylors has published works in the Journal of General Internal Medicine and Biology of Blood and Marrow Transplantation.

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Brian M. Lingerfelt, MD

Brian M. Lingerfelt, MD earned his undergraduate degree in Chemistry from Furman University in Greenville, South Carolina. He graduated from Virginia Commonwealth University School of Medicine at the Medical College of Virginia Campus in Richmond, Virginia and continued his medical training with internship and residency in Internal Medicine at Virginia Commonwealth University Health System. He completed his fellowship in Hematology and Medical Oncology at the Emory University Winship Cancer Institute in Atlanta, Georgia. Dr. Lingerfelt performed extensive laboratory research at Furman University synthesizing anti-cancer drugs and at Virginia Commonwealth University Health System analyzing the effect of checkpoint kinase inhibitors in multiple myeloma cell lines. His clinical research at Emory University focused on the inflammatory response to tyrosine kinase inhibitors in kidney cancer. He has published in the Journal of Supportive Oncology, the Journal of Pharmaceutical and Biomedical Analysis, and Bioorganic and Medicinal Chemistry. He is a member of the American Medical Association, the American Society of Clinical Oncology, and the American Society of Hematology. Dr. Lingerfelt joined Charleston Hematology Oncology Associates, P.A., in 2012.

Our Team: Physician Assistants

Mary S. MacDonald, PA-C

Mary S. MacDonald, PA-C, is a board certified Physician Assistant and has specialized in Hematology and Medical Oncology for 8 years. She completed her Master's degree as a Physician Assistant at the Medical University of South Carolina and received her Bachelor of Science with honors from Presbyterian College. She is a member of the South Carolina Association of Physician Assistants.

Jamie L. Witbeck, PA-C

Jamie L. Witbeck, PA-C is a board certified physician assistant. Jamie graduated Suma Cum Laude from James Madison University in Harrisonburg, VA in 2008, earning a Bachelor’s Degree in Kinesiology with a concentration in exercise science and a minor in biology. Jamie received her Masters in Physician Assistant studies at the Medical University of South Carolina in 2010. Originally from Pennsylvania, Jamie enjoys spending time outdoors in the beautiful weather of Charleston and stays active by running, dancing and going to the beach. She also has a passion for mission work in South Africa and plans to pursue other medical missions in the future. She is a member of the American Academy of Physician Assistants and the Alpha Eta Society, MUSC Chapter.

Eliza C. Hough, PA-C

Eliza C. Hough, PA-C is a board certified physician assistant. Eliza graduated Cum Laude from Clemson University in 2000 with a Bachelor's Degree in psychology and later received her Masters in Physician Assistant Studies from Medical University of South Carolina in 2009. She is a proud Charleston native who enjoys many things in her free time including inshore or offshore fishing with her husband and learning about photography. Professional memberships include American Academy of Physician Assistants, South Carolina Academy of Physician Assistants and Golden Key National Honor Society.

Joanna S. Harvey, PA-C

Joanna S. Harvey, PA-C is a board certified physician assistant. She graduated from Georgia Institute of Technology in Atlanta, GA in 2001, earning a Bachelor of Science in Industrial and Systems Engineering. Joanna received her Masters in Physician Assistant studies at Northeastern University in Boston, MA in2011. She is a member of the American Academy of Physician Assistants and South Carolina Academy of Physician Assistants. Joanna enjoys all things outdoors in beautiful Charleston, especially fishing and kayaking with family and friends.

Ashley J. Archibald, PA-C

Ashley attended the University of Alabama in Tuscaloosa where she graduated with a BS in Biology. She pursued her passion in medicine by attending the Physician Assistant Program at the University of Alabama in Birmingham (UAB) where she graduated among the top of her class in 2010. Since then, Ashley practiced as a PA in Asheville, NC but has happily started a new journey in Charleston. As an outdoor enthusiast Ashley is excited to experience the coastal life. She enjoys running, yoga, and spending time with her spaniel, Wilbur.

Corin D. Elg, PA-C

Corin D. Elg, PA-C is a board certified physician assistant. Originally from Illinois, Corin graduated from the University of Iowa with a Bachelor’s of Science Degree in 2005 and soon after moved to beautiful Charleston. After spending a few years working in a local obstetric and gynecology office she pursued further education at Medical University of South Carolina. Corin received her Masters in Physician Assistant Studies in 2012. She worked in the upstate after graduation but knew she needed to return to the low country. She is happy to be back working, spending time with her friends, and participating in many athletic events, all in the best city in the world!

Heather B. DuBose, PA-C

Heather B. DuBose, PA-C is a board certified Physician Assistant.  She has a Bachelor of Science degree in mechanical engineering from Bucknell University and later graduated cum laude from Medical University of South Carolina as a Physician Assistant in 2002.  She started her career in medicine working with Charleston Hematology/Oncology and has rejoined the team, after spending 8 years in Internal Medicine.  Heather enjoys reading, going to the beach, and spending time with her 2 children, parents and friends.  She is active in her church and enjoys being a parent leader in her son's Cub Scout pack.  She also looks forward to visiting her sister's family in Atlanta and traveling back to Delaware each summer to vacation in Bethany Beach.

Our Team: Nurse Practioners

Lisa S. Smith

Lisa S. Smith, MSN, APRN-BC, AOCN, received her Master's degree in nursing with an oncology specialty from Emory University after graduating from the Medical College of Georgia with a Bachelor of Science in nursing. She received an associate of science from Middle Georgia College. Ms. Smith is board certified as an adult nurse practitioner by the American Nurses Credentialing Center and as an advanced oncology certified nurse by the Oncology Nursing Certification Corporation. She is a member of Sigma Theta Tau Honor Society of Nursing, American Academy of Nurse Practitioners, Low Country Advanced Practice Nurses Association, and the National Oncology Nursing Society nurse practitioner special interest group.

Rebecca M. Orr

Rebecca M. Orr, MSN, ANP-BC, is a board certified adult nurse practitioner by the American Nurses Credentialing Center. She graduated with honors from the Medical University of South Carolina receiving a Masters of Science in Nursing with a specialty in Palliative Care. Rebecca also received her Bachelor of Science in Nursing from the Medical University of South Carolina. Rebecca has extensive clinical experience in the specialty of pain management. She is a published author in Nursing 2011 and is a member of Sigma Theta Tau Honor Society of Nursing.

Susan S. Frickman, MSN, APRN, NP-C

Susan graduated magna cum laude from Jacksonville University with a Bachelor of Science in Nursing and went on to earn a Master of Science in Nursing from Indiana State University. She is certified as a Family Nurse Practitioner by the American Academy of Nurse Practitioners and as an Oncology Certified Nurse by the Oncology Nursing Certification Corporation. Susan has an extensive background in oncology and served in various clinical and administrative roles within the Roper-St. Francis Cancer Center prior to joining Charleston Hematology Oncology Associates in 2013.

Susan is a member of Sigma Theta Tau Honor Society of Nursing, the American Academy of Nurse Practitioners, the Oncology Nursing Society, and the Blood & Marrow Transplant Special Interest Group of the Oncology Nursing Society.