Gallagher has been serving as treasurer. He joined parent UGI in 1990.
Sigman was principal accounting officer and treasurer at Newcastle Investment. He has been named AG Mortgage's principal accounting officer as well.
Mitchell was CEO of Flex Energy and has been CFO of T-3 Energy Services.
Kritzmacher was CFO at Lucent Technologies and Global Crossing.
Weber joins from Ensco, where he was vice president and treasurer.
Minson was at one point the company's deputy CFO. He also has been CFO and chief operating officer at AOL.