Ambac Financial Group, Inc. announced that Charles J. Sebaski has joined the firm as Managing Director, Head of Investor Relations, succeeding Lisa A. Kampf. Charles brings over 20 years of insurance and capital markets expertise. Charles joins Ambac from Guy Carpenter & Co where he was most recently Senior Vice President and Head of North American Business Intelligence.

Prior to that, Charles held positions as a P&C equity research analyst covering numerous insurers and brokers at BMO Capital Markets and Deutsche Bank.