Arthritis Treatment Center
3377 Main Street
Springfield, MA 01107-1113

Telephone: 413-734-5661

Our Physician Providers

Martin J. Poppo, M.D.

Dr. Poppo received his medical degree from McGill University in 1961.  He completed his fellowship training in internal medicine and rheumatology at the Cleveland Clinic in 1965.  He was a founding Fellow of the American Rheumatism Association, Chief of the Rheumatology Division at Baystate Medical Center from 1974-1992, and Director of the Rheumatology Laboratory there from 1970-1991.  He established Rheumatology Associates (now the Arthritis Treatment Center) in Springfield, MA, in 1977.  Dr. Poppo is a Fellow of the American College of Rheumatology and Associate Clinical Professor of Medicine at Tufts University School of Medicine.

Robert G. Gray, M.D.

Dr. Gray received his medical degree from Boston University in 1969.  He completed his internship and internal medicine residency between 1969 and 1974, with a two year hiatus due to the draft during which time he served as post surgeon at Fort Greely, Alaska.  He completed a rheumatology fellowship at the University of Miami Affiliated Hospitals in 1976.  He is a senior author or coauthor of 50 scientific articles and medical textbook chapters.  Board certified in internal medicine and rheumatology, Dr. Gray is a fellow of the American College of Physicians and an Associate Professor of Medicine at Tufts University School of Medicine.

Scott Halista, M.D.

Dr. Halista received his medical degree from Jefferson Medical College, Philadelphia, PA in 1982.  He completed his fellowship training in Rheumatology at the Walter Reed Army Medical Center in Washington D.C., while serving on Active Duty with the U.S. Air Force.  A rheumatologist at the Arthritis Treatment Center since 1992, Dr. Halista's previous practice experience includes working on the teaching facility for the U.S. Air Force Rheumatology Fellowship Program at Wilford Hall USAF Medical Center, Lackland AFB, San Antonio, Texas. He was appointed Division Chief in Rheumatology for the residence training program at Baystate Medical Center, Springfield, MA (a Tufts Medical School Affiliate).  Dr. Halista holds the position of Assistant Professor of Medicine at Tufts University School of Medicine.

C. Bruce Tallman, Jr., M.D.

Dr. Tallman received his medical degree from Boston University School of Medicine in 1989.  He completed his fellowship training in rheumatology at the University of Massachusetts Medical Center.  A rheumatologist at the Arthritis Treatment Center since 1994, Dr. Tallman is board certified in Rheumatology, a fellow of the American College of Rheumatology and holds the position of senior clinical instructor of medicine at Tufts University School of Medicine.


Donald R. Griger, M.D.

Dr. Griger received his medical degree from Dartmouth Medical School in 1992.  He was elected into the Alpha Omega Alpha Honor Medical Society in addition to being awarded an Air Force Health Professions Scholarship.  He completed his fellowship training at Wilford Hall Medical Center, Lackland AFB, San Antonio Texas.  A rheumatologist at the Arthritis Treatment Center since 2000, Dr. Griger's previous practice experience includes Chief of Rheumatology at David Grant Medical Center, Travis AFB, California.  Dr. Griger is board certified in rheumatology, is a Fellow of the American College of Rheumatology and is a Senior Clinical Instructor of Medicine at Tufts University School of Medicine.

Antonio Valentin, M.D.

Dr. Valentin received his medical degree from New York Medical College, Valhalla, NY in 2001.  He completed residence in Internal Medicine at Stony Brook Medical Center, Stony Brook, NY in 2005.  He started his practice at the Arthritis Treatment Center shortly after completing his fellowship training in rheumatology at the University of Connecticut Medical Center, Farmington, CT in 2007.  Dr. Valentin is a Fellow of the American College of Rheumatology since 2008, and is a Senior Clinical Instructor of Medicine at Tufts University School of Medicine.