ACS of Md

Comprehensive Arthritis Care


About Us

This rheumatology practice has been located in the Crossroads Medical Building in Ellicott City, MD since 1991.  Over that 25 years, we have registered over 80,000 patients, most of whom have been referred by primary care physicians from the greater Baltimore and central Maryland region although it is not uncommon to see patients from Pennsylvania, West Virginia, Virginia, Washington, DC, and Delaware.


Paul A. Gertler, MD (adult rheumatology) graduated from University of Maryland Medical School and completed his Residency/Fellowship at George Washington University.  He is board certified in Internal Medicine and Adult Rheumatology.  He has been practicing clinical rheumatology in Baltimore and Ellicott City for 32 years. 


Stephen W. George, MD (adult & pediatric rheumatology) graduated from University of Maryland Medical School  in 1986 and completed his Residency/Fellowship at Geisinger Medical Center in Pennsylvania.  He has been board certified in Internal Medicine, Pediatrics, Adult Rheumatology, and Pediatric Rheumatology. In addition to 25 years working for this practice, Dr. George had been the head of the Pediatric Rheumatology at University of Maryland from 1996 through 2013.

Melissa Hawkins-Holt, MD (adult & pediatric rheumatology) graduated from University of Maryland Medical School where she also completed her Residency/Fellowship.  She is board certified in Internal Medicine, Pediatrics, and Rheumatology.  In addition to her 13 years in this practice, she is the current head of Pediatric Rheumatology at University of Maryland since 2014.

Thomas J. Lang, MD, PhD  (adult rheumatology) graduated from University of Maryland School of Medicine. He is board certified in Internal Medicine and Rheumatology. Dr Lang was Professor of Medicine in UMMS Department of Rheumatology for 7 years where he was the Chief of the Arthritis Clinic, Baltimore VA Medical Center and Director of Clinical Education at the University of Maryland School of Medicine.  He joined this practice in 2004.

Moe T. Zan, MD (adult rheumatology) completed her Internal Medicine residency in Danbury, Conn. and comleted her Rheumatology fellowship at Dartmouth in 2010.  She is board certified in Internal Medicine and Adult Rheumatology and has practiced clinical rheumatology at Dartmouth and Johns Hopkins.  She joined this practice in 2013. 

Marlyn Lorenzo, MD  (adult rheumatology) completed her Rheumatology fellowship in 2005,after her Internal Medicine residency, at Cabrini Medical Center in New York City. She has been a staff rheumatologist at Mercy Hospital in Baltimore since 2005 and was the Chief of Rheumatology 2010 to 2015, before joining our group in early 2016.

David Arconti, PA-C is a certified Physician Assistant who completed his education and training at De Sales University, then practiced inpatient hospitalist care at Franklin Square Hospital before joining ACS of Md in 2012.


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