Peggy has a Bachelor of Arts from Virginia Polytechnic Institute and State University and a Juris Doctor from the University of Virginia.  She also has a Diploma in Superannuation Management from Macquarie University.

Peggy has been a non-executive director of several companies in the superannuation and financial services sectors. She is currently the chair of Vanguard Superannuation and is also a director of Infrastructure Specialist Asset Management.

Peggy is on the board of Women's Housing Limited, on the investment advisory panel of Home for Homes (an initiative of the Big Issue) and is an ambassador for micro-finance organisation, Opportunity International. She is also on the board of Australia Dementia Network Limited.

Peggy is a Fellow of the Australian Institute of Company Directors and is also a member of Chief Executive Women and the Melbourne Forum.

Peggy has been president of the Richmond Football Club since October 2013, having served on the Club's board since 2005. She is the first woman to be president of an AFL club, and the Richmond Football Club won the 2017, 2019 and 2020 premierships.  In April 2018, Peggy was appointed by the AFL to its inaugural Competition Committee which advises the AFL Commission on issues regarding the design and future of the AFL competition.

In August 2014 she was appointed to chair the Victorian Minister for Sport's year-long Inquiry into 'Women and Girls in Sport and Active Recreation' and until June 2018 was convenor of the Minister's Change Our Game Champions program.