With Zurich Insurance, he led a team of Oxford academics on a 6 year-long consultation on individual behavior and risk and uncertainty in household decision-making.

[12] At the Harvard Kennedy School he led faculty and student-based consulting projects with governmental organisations, and at Oxford, he has advised major corporations[f] on their global environmental performance.

He is the co-author of Regional Dynamics: Studies in Adjustment Theory (Allen & Unwin, 1986) and the author of Unions and Communities Under Siege (CUP, 1988).

He has also published research on political theory as represented by State Apparatus with Michael Dear (Allen & Unwin 1982) and the role of judicial decision making in the development of American cities.

[c] In 2005, Clark was elected Fellow of the British Academy (FBA),[14] and in 2014 received an honorary doctorate from the Panteion University of Athens.