Erdman was born Mausas Erdmanas on September 29, 1922, in Tverai, Lithuania. He emigrated to the United States at age 17[1] to live with an uncle in Chicago.
Erdman started a construction company in 1946, which he incorporated in 1951 as Marshall Erdman & Associates. An integrated healthcare design-build company, Marshall Erdman & Associates grew rapidly, expanding into six different markets throughout the U.S. In early 2008, Marshall Erdman & Associates was purchased by Cogdell Spencer, a healthcare real estate investment trust, for $247 million. This part of Marshall's legacy is now traded on the NYSE as CSA.
In addition to founding Marshall Erdman & Associates, he introduced U-Form-It prefabricated house kits to the market in 1953 and Techline office furniture in 1969.
Erdman married Joyce Mickey (1924–1992), a UW-Madison student, in 1946,[3][4] with whom he had four children.[5] Erdman cut off ties to his remaining family members after marrying Mickey.[6]