Lehman is EMEA head of collateral management and segregation at BNY Mellon Markets, a role she took up in 2015.
Her responsibilities include driving business growth, product management, client relationship management, service delivery and regulatory issues.
Lehman is also a member of the EMEA extended executive and operating committees at BNY Mellon. She joined the bank in 2003 and has held multiple roles, including head of securities finance in the EMEA.
A decision on Lehman's replacement will be announced in due course.