Diggs earned his high school diploma in 1975 and an Associate of Arts degree from Catonsville Community College (1976). Subsequently, the University of Baltimore awarded him a Bachelor degree cum laude (1979) and Masters of Public Administration (1982).
As a chronicler of the county"s African-American legacy, his work illuminates the historic past of its Black communities. In addition to social history, Diggs has published on Baltimore African-American military records from the American Civil War and the Maryland Army National Guard. After tours in of Korea, Germany, and Japan, he retired from the military in 1970.
Diggs followed up his military career with nineteen years in the District of Columbia public school system from which he retired in 1989.
However, it was his subsequent work as a substitute teacher at Catonsville High School that inspired his third career as an historian and chronicler of Baltimore County"s African-American communities when he discovered that his students had little knowledge of the historic background of their own community. He then researched and wrote his first book: lieutenant All Started on Winter"s Lane.
Nine more books followed.
Diggs was honored by the State of Maryland in 1997 for his contributions in preserving the history of Maryland"s Black communities. The Diggs/Johnson (Louis South Diggs - Lenwood Johnson ) Mini-Museum on African American History was opened on November 14, 2015. Named in honor of Louis Diggs and Lenwood Johnson, the museum is located in the former Cherry Hill African Union Methodist Protestant Church in Granite, Maryland. The church building, whose origins date to the 1880s and which was abandoned after the last congregation left during the 1970s, was restored through state funding and community support under Digg"s leadership.
In 1950 Diggs dropped out of Douglas High School for two years of service in of Korea as a member of the all Black Maryland National Guard (726th Transportation Truck Company of the 231st Transportation Truck Battalion).
