Lewis W. Marshall Sr., a physician who specialized in internal medicine and infectious diseases, died Jan. 23 at Providence Hospital in Washington. He was 79.

The cause was colon cancer, said his wife, Paula Marshall.

Dr. Marshall, a Washington resident, opened an internal medicine and infectious diseases practice at Providence Hospital in 1976. He served as the hospital’s chief of infectious diseases for the department of internal medicine and general practice for 38 years and served as the chairman of the infection control committee of the medical-dental staff for 21 years. In 2009, he moved and opened a private practice in Hyattsville.

Lewis West Marshall was born in Culpeper, Va., and raised in Washington, where he was a 1951 graduate of Dunbar High School. He received a bachelor’s degree in 1955 and a medical degree in 1959, both from Howard University. He served in the Air Force Reserve from 1963 to 1965.

Dr. Marshall taught at Howard University’s medical school from 1970 to 1975 and was a guest lecturer in the university’s microbiology department from 1978 until 2007.

He was co-director of the Medicine for Peace Health Center and made volunteer trips with the humanitarian organization to Bosnia and Herzegovina, Iraq and Haiti. He was a founding member and past president of the Jazz Listening Group in Washington.

He received community awards for his contributions to the field of health and his humanitarian efforts. On March 7, Providence Hospital created a medical training program in his honor.

His first marriage, to Sylvia Kinard, ended in divorce. His second wife, Georgellen Muriel Marshall, died in 1992 after 11 years of marriage.

Survivors include his wife of nine years, Paula Senior Marshall of Washington; four children from his first marriage, Lewis Marshall Jr. of Wayne, N.J., Peter Marshall of Purcellville, Va., John Marshall of Robbinsville, N.J., and Sheri Marshall of Sarasota, Fla.; three stepchildren, Herbert Muriel of St. Thomas, U.S. Virgin Islands, Phillip Muriel of Owings Mills, Md., and Kimberly Harris of Takoma Park, Md.; a brother; seven grandchildren; and two great-grandchildren.

— Megan McDonough