Kenneth Brecher (born December 7, 1943) is an American professor of astronomy and physics, emeritus at Boston University, with a focus on high-energy astrophysics, relativity, and cosmology.
He has also worked on the history of astronomy, archaeoastronomy, and the application of early astronomical records to modern astrophysical problems.
He was a co-founder of the Historical Astronomy Division of the American Astronomical Society, with John A. Eddy and Owen Gingerich.
[5] Brecher's early work on Einstein's Theory of Relativity earned him an appearance in the 1979 film Einstein's Universe, narrated by Peter Ustinov with explanations of relativity from fellow professors Sidney Drell, Roger Penrose, Wallace Sargeant, Dennis Sciama, Irwin Shapiro, and John Archibald Wheeler.
Brecher has had a longstanding passion for art and many kinds of "physics toys", including spinning tops[9] and kaleidoscopes[10].