Stephen H. Schneider, an influential climatologist who used the results of complex scientific models he developed to become a leader in pressing for action to address global warming, died Monday in London. He was 65.

His wife, Terry L. Root, said he died of a heart attack or an embolism on a flight from Sweden as the plane was landing in London.

Dr. Schneider wrote books on the effects of climate change on areas as diverse as politics and wildlife. He advised the administration of every president from Richard M. Nixon to Barack Obama and was part of a United Nations panel on climate change that shared the 2007 Nobel Peace Prize with former Vice President Al Gore.

In 2001, Dr. Schneider was found to have mantle cell lymphoma, a rare type of non-Hodgkin’s lymphoma, and he applied the same sort of analysis to the disease that he used in his scientific work. He wrote a book four years later when the disease was in remission, “The Patient From Hell.”