Michelle Sartain (pictured left) will succeed Donnelly as president of Marsh US. She will oversee Marsh's insurance brokerage and risk advisory businesses across the country. Based in New York, she will report to South and Pat Tomlinson, CEO of Marsh McLennan US and Canada. Sartain was previously head of Marsh Specialty for the US and Canada, and has more than 25 years of experience serving in roles of increasing responsibility at Marsh. South said: "Pat and Michelle are exceptional leaders; their appointments are a testament to the incredible talent and expertise that exists within our organisation.