Dennis Mahoney is a 50 year veteran of the insurance industry. He started his career in 1968 at Lloyds insurance broker Price Forbes. That firm then merged with Sedgwick Collins and then Bland Payne to create the Sedgwick Group, now part of Marsh& McLennan. During his career Dennis was fortunate to work in most classes of both insurance and reinsurance. After graduating from the Harvard Business School PMD program, he was appointed deputy chairman of Sedgwick North America.
In 1984 he was recruited to lead Alexander Howden the Lloyds broker acquired by US broking giant A & A ( Alexander & Alexander).
Following the acquisition of A&A by Aon in 1997, Dennis was appointed as Chairman and CEO of Aon's Wholesale and reinsurance operations. Dennis relocated to Bermuda in 2007 as Chairman of Aon Global. He retired in 2010.
Appointed as an independent director of Ironshore in 2012, he chaired the underwriting and risk committee. Following the sale of Ironshore to Fosun, he remained with the company until its sale to Liberty Mutual in 2016.
In 2015 Calera Capital acquired RFIB (Robert Fleming Insurance brokers ) and Dennis joined as co-investor and Executive Chairman. RFIB was acquired by Odyssey capital (Integro/Tysers ) in 2019 and Dennis stepped down. He remains with the group until his contract expires in 2021.