Lois (née Milton) Zimmerman was born in 1923 near Philadelphia, Pennsylvania. She graduated from high school in Pittsfield, Massachusetts, and earned a BA degree from Lesley College, a teacher training college in Cambridge, Massachusetts. During her time in Cambridge, she met her husband who was training to become a chaplain in the army. Their oldest child Donnie died of polio at age seven; they had four other children. She was a kindergarten teacher for many years, including during the era of school desegregation in Indianapolis, Indiana.

In the late 1960s and early 1970s Hugh M. "Buck" Davis, a lawyer with the Detroit National Lawyers Guild, worked with Chicago Seven Trial lawyers William Kunstler and Leonard Weinglass to represent John Sinclair, Pun Plamondon, and Jack Forrest in Ann Arbor's CIA Bombing Conspiracy case.