January, 1955, New York City. (Declines to give exact date of birth, citing security concerns.)EDUCATION
B.A., math and economics, Lawrence University, 1977; MBA, Northwestern's Kellogg School, 1979.FAMILY
Married to Julie. They have five children: Suzie, 14; Andrew, 11; Shannon, 8; Diane, 4; and Daniel, five months.JOBS AT BAXTER
Became CFO in 1993; named CEO in 1999; chairman since 2000.FAVORITE CHORE
Chauffeuring the kids.LEAST FAVORITE
Cooking.BEHIND THE NAME
Jansen is his wife's maiden name.