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Meet Our Providers

Lawrence E. Gelber, M.D.

IMG 5176Lawrence E. Gelber, M.D. received a BA in biological science at Indiana University and a BS in biology at Fairleigh Dickinson University. He attended medical school at the University of Modena School of Medicine and Surgery and the Center for Technological Studies, School of Medicine. He completed residencies in pediatrics and neonatology at the Medical Center of Delaware where he served as a chief resident. He was a research assistant in internal medicine and allergy and immunology at the University of Virginia. He then completed a fellowship in allergy and clinical immunology at UVa.

Robert S. Call, M.D.

Robert S. Call, M.DRobert S. Call, M.D. received his allergy training at the University of Virginia and remained on staff as an Instructor in Medicine for 2 years teaching and researching Asthma before moving to Richmond. Prior to his fellowship in Allergy, he did his Internal Medicine training at Michigan State University, Grand Rapids Campus. He is a Graduate of University of Virginia's Medical School and School of Arts and Sciences where he received an MD and a BA in Biology.

William T. Hark, M.D.

William T. Hark, M.D. William T. Hark, M.D. received a BA in biology at the University of Virginia. He then attended medical school and completed a residency in internal medicine at the Medical College of Virginia (Virginia Commonwealth University) in Richmond. Dr. Hark returned to the University of Virginia for his allergy and clinical immunology fellowship.

Margaret Hollister Sigman, M.D.

Dr. Margaret Sigman Margaret Hollister Sigman, M.D. is a Richmond native graduating as valedictorian from Longwood University. She then attended medical school at the Medical College of Virginia (Virginia Commonwealth University) in Richmond and completed a residency in pediatrics and fellowship in allergy and immunology at Louisiana State University Health in Shreveport, LA. Dr. Sigman is a Board Certified Pediatrician and Allergist/Immunologist. She has previously practiced at Cornerstone Pediatrics at Premier in High Point, NC. She is a member of the American Academy of Allergy, Asthma and Immunology and the American College of Allergy, Asthma and Immunology.

Deanna W. Tanner, PA-C

Deanna Tanner, PA-C Deanna W. Tanner, PA-C received a BS in biology graduating Suma Cum Laude from Bridgewater College in Bridgewater, VA and her Master of Physician Assistant Studies at Shenandoah University in Winchester, VA. Deanna's training and experience includes working in a busy outpatient family medicine clinic for 3 years which involved all aspects of patient care including treatment of respiratory tract infections, allergies, asthma, gastrointestinal illnesses and COPD. Deanna's volunteer experience includes a medical mission trip to Nicaragua and working on the Nottoway County Emergency Squad.

David K. Moon, PA-C

David K. Moon, PA-CDavid K. Moon, PA-C received a Bachelors of Social Work at James Madison University, VA and his Masters of Science in Health Science, Physician Assistant at The George Washington University, Washington, D.C. David is a member of the American Academy of Physician Assistants and a member of the Virginia Academy of Physician Assistants.

Francis Stanford Massie, Sr., M.D.

Francis Stanford Massie, Sr., M.D. has left big shoes to fill since his passing in 2014. He trained in pediatrics and allergy at the University of California at San Francisco Medical Center where he was a chief resident. He was recruited to VCU/MCV and from 1967-1977 he taught general pediatrics as a fulltime academician. He developed the first Board-approved training program in pediatric allergy in Virginia. He was a clinical professor of pediatrics at MCV for over 25 years and was a co-founder of the Virginia Allergy and Asthma Society, serving as President twice. Our current providers are now benefiting from Dr. Massie’s impressive contributions to the field.

John B. Catlett, M.D.

John B. Catlett, M.D. was the founding member of Catlett Allergy Associates that became Richmond Allergy and Asthma Specialists on January 1, 2003. He retired from medical practice on July 1, 2001 and is now deceased. Drs. Gelber, Call, Hark and Sigman are still benefiting from Dr. Catlett's wisdom and long experience in the field of allergy.