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Advisory Board

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Peter Culp


Peter Culp is the managing partner and co-founder of Culp & Kelly, LLP, a specialty water and natural resources law and policy firm. Based in Phoenix, Arizona, Peter is a nationally recognized expert in Western water law and water policy. He has more than 20 years of experience working on a broad range of water law and policy, natural resources law and policy, U.S. environmental law, and federal Indian law matters. Peter represents a variety of municipalities, water agencies, industrial and energy concerns, developers, investment firms, and nonprofit organizations and foundations, and he is a respected strategic advisor to clients facing the challenges of water and natural resource scarcity in the West.

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Peter has served on a variety of boards and commissions related to water and natural resource issues and policy matters, including serving by repeated gubernatorial appointment to the Arizona Colorado River Advisory Commission. He also continues to participate in a series of binational working groups under the U.S. Department of State, International Boundary and Water Commission, developing and implementing new bi-national strategies for the management of Colorado River water supplies in the face of growing water scarcity. This work has included high-level participation in the development, negotiation, and implementation of five new international agreements (Minutes 316, 317, 318, 319, and 323) that have significantly re-shaped the relationship between the U.S. and Mexico with regard to water resource management and ecosystem protection.

Peter has been twice awarded the Partners in Conservation Award by the U.S. Department of Interior, given by U.S. Secretaries of the Interior Ken Salazar in 2009 and Sally Jewell in 2014 in connection with his work on Colorado River policy and the development of Minute 319. For the latter work, he was also a recipient of The Nature Conservancy of Arizona’s 2013 Outstanding Conservation Achievement Award and the Arizona Capitol Times Leader of the Year Award in Public Policy. He is recognized in Chambers USA, Best Lawyers, and he also is a Fellow of the American College of Environmental Lawyers.

Prior to founding Culp & Kelly, LLP, Peter was a partner in the Phoenix office of Squire Patton Boggs, LLP. After joining the partnership in 2008, he managed the firm’s Western water and natural resources practice. Peter has also worked as a law clerk in the Indian Resources Section of the U.S. Department of Justice, Environment, and Natural Resources Division, and as an in-house attorney with the Sonoran Institute, a nonprofit organization that works on land and water policy issues throughout the intermountain West. Prior to embarking on his legal career, Peter’s endeavors included managing a nonprofit public health technology enterprise for C. Everett Koop, the former U.S. Surgeon General, managing forest fires in the Northern Rockies as part of an Incident Management Team, and driving long-haul refrigerated freight in the U.S. and Canada.


Dianne Dillon-Ridgley


In her own words, “COURAGE is the catalyst for change,” and Dianne Dillon-Ridgley is the very definition of a changemaker. Shattering glass ceilings and claiming her place at the table to be a voice for equity and sustainability throughout her life, Dianne leads with courage and passion. Over the last 40 years, Dianne has been a dedicated environmentalist and human rights activist at the forefront of society’s shift from industrial to sustainable.  Appointed by three U.S. Presidents across three administrations, Dianne has served on more than 23 U.S. delegations at the United Nations and other global meetings. By appointment of the White House,  she attended the 1992 Earth Summit in Rio, followed by the 1997 UN General Assembly Special Session and the 2002 World Summit on Sustainable Development in South Africa, making her the only person to serve on all three U.S. delegations.

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Dianne has and continues to serve as a trustee and on the boards of many institutions and organizations.  She currently is the co-chair of the Green Leadership Trust, a network of people of color and indigenous people who serve on nonprofit boards throughout the U.S. The organization is working to build a more powerful environmental movement by diversifying its leadership. Dianne also currently serves on the board of the Vermont Energy Investment Corporation.

Dianne served on the board of directors of Interface, Inc. for two decades, working with the legendary CEO Ray Anderson to transform carpet manufacturing into a sustainable company that sparked a modern revolution in industry approaches.

For more than a dozen years, she was a trustee at the Center for Environmental Law (CIEL) and was the first female or person of color to chair the CIEL board. She also served on the board of the National Wildlife Federation for more than a decade and as a trustee of the International Board of Auburn University’s School of Human Sciences. In addition, she helped to found “the 100 Grannies for a Livable Future.”

Dianne also has served on the boards and in leadership roles for many other organizations throughout her career, including the Association of Iowa Human Rights Agencies, the Women’s Environment and Development Organization, the Women’s Network for a Sustainable Future, and the River Network.

Dianne is committed to establishing the “Age of Sustainability,” by facilitating the changes needed in our societal architecture, democratizing institutions, expanding human rights to achieve gender and racial equality, breaking down barriers and opening minds as well as doors, and creating a new language and framework to catalyze society.

Dianne lives in Iowa City, Iowa. She has two adult children, Karima, who graduated from Harvard University, and Dasal, who graduated from Morehouse College in Atlanta.