CASTEN, SEAN, a Representative from Illinois; born in Dublin, Ireland, November 23, 1971; graduated from Woodlands High School, Hartsdale, NY, 1989; B.A., Middlebury College, Middlebury, Vt., 1993; M.S., Dartmouth College, Hanover, N.H., 1998; M.E.M., Dartmouth College, Hanover, N.H., 1998; businessman; scientist; consultant; elected as a Democrat to the One Hundred Sixteenth Congress (January 3, 2019-present).