Anne Marie Towle will step down as executive vice president and captive practice leader at Marsh on 6 September.
Towle has over 20 years of experience in the sector and has worked in many key onshore and offshore domiciles.
She served at JLT as executive vice president and captive practice leader before the firm was acquired by Marsh earlier this year.
In addition, Towle has worked at Willis Towers Watson, KPMG, Crowe Horwath, EY and more.
Towle explained that she will announce the next step in her career path soon. Marsh has declined to comment on the departure.