Ambac Financial Group announced the appointment of John Tatum as a Managing Director and Business Development Officer for its insurance distribution division, Cirrata Group. In this position, he will be responsible for expanding the company's platform of managing general agencies (MGAs) and managing general underwriters (MGUs). He also will launch Cirrata's second de novo MGA, which will focus on the construction industry.

Tatum will report to R. Sharon Smith, Chief of Staff. Tatum, who is based in Chicago, has more than 25 years of experience in the insurance industry. For the past six years, he was Executive Vice President and Head of U.S. Programs for AXIS, where he was responsible for all programs and binding authorities for AXIS Insurance across the U.S. market.

Prior to that, he spent 15 years at CNA Financial Corporation, rising to Senior Vice President of CNA's Middle Market, Construction and Large Casualty Business Units. As part of his responsibilities, he led CNA's Commercial Affiliation Marketing Programs for more than 10 years. Tatum earned a bachelor's degree in economics from Princeton University and a Master of Business Administration from Cornell University.

He also completed the Insurance Executive Development Program at the Wharton School of the University of Pennsylvania.