Public opinion research pollster, aide to Michigan governor George Romney. Polling materials prepared for various Republican campaigns, notably the gubernatorial campaigns of George Romney in 1962 and 1966, Romney's campaign for president, 1967-1968, and the gubernatorial campaign of William Milliken, 1970; and polls conducted on state issues including detailed demographic information on the views of ethnic, religious, and racial minorities; also survey done for Senator Robert Griffin in 1971, and on attitude of state voters towards abortion in 1972. A small collection of material donated in 2013 is related to George Romney's son and the 2012 Republican presidential candidate, Mitt Romney.
The papers of Walter De Vries reflect primarily his work for Romney and Milliken from 1962 until 1970. The papers are divided into two series, De Vries office files and polling data.