Allan Marks is a Senior Fellow at the Columbia Center on Sustainable Investment, a joint center of Columbia University’s Law and Climate schools, and teaches law and finance at the University of California, Berkeley and UCLA.

Allan is a retired partner at Milbank LLP, where he was a member of the firm’s Global Project, Energy & Infrastructure Finance group and the Private Equity, Renewable Energy, Latin America, and Global Risk & National Security practices. A lawyer for over 30 years, he has handled complex transactions in the United States, Canada, Latin America, Asia, and Europe with an aggregate value of over $100 billion. He is one of the world's leading project finance lawyers with deep expertise across multiple sectors: power and renewable energy, transportation, water, airports, rail, port terminals, alternative fuels, social infrastructure, and telecommunications and digital infrastructure. Focused on energy and infrastructure project finance and development, his practice encompasses international and cross-border transactions, private equity, mergers & acquisitions, capital markets and private placements, joint ventures, restructurings, construction, banking, insurance and regulatory matters, and a range of commercial transactions.

He is a Senior Advisor at SidePorch and a contributor to Forbes. He speaks and publishes on sustainability, energy, infrastructure, cross-border transactions, climate change, and regulatory policy. He was a delegate to the COP27 UN Climate Change Conference, served as a USAID consultant in India, and was the founding co-chair of the State Bar of California's Subsection on Public-Private Infrastructure. He serves as a board director of the Colburn School, Street Symphony and MoveLA.

Allan earned a BA in International Studies from The Johns Hopkins University and a JD from the University of California, Berkeley School of Law. He also studied in Vienna, Austria (where he interned at UNIDO) and Freiburg im Breisgau, Germany.