It's George W. Bush, the 43rd President of the United States. He created the USA Freedom Corps, asking every American to dedicate 4,000 hours or two years of their lives to service.
Source: "In the Days of DKE and S.D.S."; by Carter Wiseman '68
February 2001; Yale Alumni Magazine (http://www.yalealumnimagazine.com/issues/01_02/bush.html)
http://usinfo.state.gov/topical/transition/bush.htm
http://search.biography.com/print_record.pl?id=23367