He has served as Arbitrator on the Claims Resolution Tribunal for Dormant Accounts in Switzerland and the Appeals Tribunal of the International Commission on Holocaust Era Insurance Claims, and currently sits on the North American Free Trade Agreement (NAFTA) Chapter 14 Financial Services Roster.

The President of the United States in 2008 appointed Park to the Panel of Arbitrators for the International Centre for Settlement of Investment Disputes.

[4] Park was born in Philadelphia but grew up in Cohasset, Massachusetts, where he was President of the Student Council and ran on the track and cross country teams.

During his early career he worked in Paris and Geneva and taught at Cambridge University, before returning to teach in Boston and live in Cohasset.

Known as "Rusty" since childhood, Park is a Justice of the Peace in Massachusetts and a long-time member of the congregation of King's Chapel in Boston, where he has held the post of Senior Warden and currently serves as Trustee.