Lynn has worked in the private sector (15 years in funds management, including 4 years as CEO of the Investment and Financial Services Association), the not-for-profit sector (6 years as General Manager of Sydney Dance Company) and the public sector (as Deputy Chairman of the Australian Securities Commission 1993–97).
In 2002, she founded Cameron Ralph P/L (along with Alan Cameron), a firm which assists boards to improve their performance. She lectures and writes regularly on corporate governance.
She is currently a Director of Babcock & Brown Direct Investment Fund, the Sydney Swans, and The Sydney Institute. She is a Fellow of the Australian Institute of Company Directors, a Fellow of the Financial Services Institute of Australasia, a member of the St James Ethics Centre, and the Rotary Club of Sydney.
Lynn has previously been Chairman of the AMP Foundation, Chairman of the Centennial Park and Moore Park Trust, and a Director of NRMA Limited, NRMA Insurance Limited, the Financial Industry Complaints Service, Chunky Move Ltd, the Australian Choreographic Ensemble, and AFL (NSW/ACT) Commission.