Frantz, a Republican, was first elected to the Connecticut Senate in 2008, representing the 36th Senate District, which includes all of Greenwich and parts of Stamford and New Canaan. He was endorsed by the Greenwich Time newspaper in his bid for re-election, as well as by the Connecticut Business and Industry Association. He was re-elected to the state Senate in 2010, where he serves as Assistant Minority Leader and on the Finance, Revenue, and Bonding Committee, as well as serving on the Banks Committee, the Commerce Committee, and the Transportation Committee.
Frantz also served as chairman of the Connecticut Development Authority and the Bradley International Airport Board of Directors. He also has served on number of other public and nonprofit boards, including the Connecticut Brownfield Redevelopment Authority and the Greenwich Teen Center. He is also known as a prominent fundraiser for Republican candidates, including serving as the host for a 2006 Republican event featuring President George W. Bush. Frantz is the president and chairman of Haebler Capital, a private investment capital firm based in Greenwich. Frantz is a 1982 graduate of Dartmouth College and a 1986 graduate of Dartmouth's Tuck School of Business.
The current assessed value of the property is $12,320,700, according to public records. This 10,256 square foot single family home has 5 bedrooms and 6.0 bathrooms on 4.05 acres. The Frantz family does not own the land past the midway section of the bend after the baseball field.