He was educated at Bowdoin College, Brunswick, Maine (B.A., psychology, 1985); Lewis and Clark College, Portland, Oregon (J.D., 1994; certificate in natural resource law).
Jewett has served on the Ripton School Board. He was a member of the District 9 Environmental Commission.
He worked for the Addison County Regional Planning Commission (past delegate).
He is a member of the Vermont Bar Association.
He also was a Member of the House in 2003-2004, 2005-2006, 2007-2008, and 2009-2010.
He is married to Jean Dickson Cherouny and they have two daughters, Anneke and Abigail.