Siegfried S. Hecker is a professor of practice at the Middlebury Institute of International Studies at Monterey, a professor of practice at Texas A&M University, and a former director of the Los Alamos National Laboratory and professor emeritus of Stanford University.

Hecker was previously with Stanford University’s Center for International Security and Cooperation (CISAC) and the Freeman Spogli Institute for International Studies and a research professor in the Department of Management Science and Engineering at Stanford. He is director emeritus of the Los Alamos National Laboratory, where he served as director from 1986 to 1997 and as senior fellow until July 2005.