He served on the Sierra Club board of directors for 11 years in three periods, as a petition candidate supported by reform-activists known as the John Muir Sierrans.

Since the late 1980s, Dorsey has worked with firms, non-profits, foundations, governments and a multitude of others on the interplay of multilateral environment policy, finance and economic development matters across the Americas, Africa, Asia and Europe.

Dorsey was appointed and re-elected to the Sierra Club Board of Directors in 2012 (for two years) and 2014 (for a full three-year term).

While he was at Dartmouth College, from 2007 to 2008, Dr. Dorsey served as an environmental advisor on the Barack Obama 2008 presidential campaign.

There he collaborated with two former Wesleyan students: Evan Weber and Matthew Lichtash, and obtained a $30,000 grant plus free office space provided by the Sierra Club to draft an ambitious plan for climate action, which was the basis for the incorporation of the US Climate Plan 501(c)(3) nonprofit (aka Sunrise Movement Education Fund) incorporated in January 2014.

[12] Dorsey is also co-founder and former board member of Islands First, a multilateral negotiating-capacity-building organization for small island developing states facing disproportionate threats from unfolding climate change; a co-founder of Detroit XPAC, a nonpartisan political action committee whose goal is to help the expats of Detroit and of Michigan connect with their hometowns by collecting contributions and supporting candidates who will revitalize Detroit in a fiscally and environmentally responsible manner; and U.S.

[13] Dr. Dorsey has published dozens of articles on a variety of environment, development and sustainable finance matters.