Warren Karlenzig is president of Common Current, a global consultancy for urban sustainability planning, policy and development.

He has led urban sustainability strategy with clients including the The White House Office of Science and Technology; the United Nations; the nations of South Korea and Japan; Lawrence Berkeley National Laboratory; US Department of State; nation of China's Ministry of Housing and Urban-Rural Development (MoHURD); US EPA; State of California; Asian Institute of Energy, Environment & Sustainability; Guangzhou, China Planning Agency; the Municipality of Beijing; Ecocity Builders; the Packard and Columbia foundations, and the private sector, including Autodesk; Skidmore, Owings & Merrill; NRG and IDEO.

He is co-author of the 2012 United Nations publication,The Shanghai Manual: Guide for Sustainable Development in the 21st Century. Warren wrote the original language for one of the nation's first municipal green building ordinances (San Francisco). The former Chief Strategy Officer of SustainLane, Warren is author of How Green is Your City? The SustainLane US City Rankings.

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Warren has a Master’s degree from Naropa University in Boulder, Colorado and a Bachelor of Science degree from the University of Illinois at Urbana-Champaign. He has published book and journal chapters with the Wharton School of Business/ University of Pennsylvania, the University of California Press and the Woodrow Wilson Center for International Scholars, along with numerous other institutions. He has lectured widely on urban sustainability and resilience for the University of Chicago (Booth School of Business), Stanford University, the University of California at Berkeley (Haas School of Business), the Technical University of Vienna, and Seoul National University as well as has addressed the European Union in Brussels and the State Council (in Zhongnanhai, Beijing) of China.

He is a fellow at the Post-Carbon Institute, an international advisor to the Climate Project and an advisory member of the Korea Green Foundation and the Urban Resilience Council of the Sherwood Institute.