Michael Brune is the executive director of the Sierra Club, an American environmental organization founded by preservationist John Muir in 1892. Brune was appointed to his position as executive director in January 2010.
In 1999, while working at the Rainforest Action Network, Brune ran a successful campaign to get Home Depot stores to stop purchasing and selling wood from old-growth forests. Time magazine listed this as its top environmental story of that year.
In 2008 he published a book called Coming Clean -- Breaking America's Addiction to Oil and Coal.
In 2014 Brune was confirmed as the Hillary Institute of International Leadership's Hillary Laureate in recognition of his work on climate change issues. He was then awarded, jointly with Amazon Watch's Atossa Soltani, the four yearly Hillary Step prize.