Jonathan Anders Bagger (born August 7, 1955) is an American theoretical physicist, specializing in high energy physics and string theory and known for the Bagger–Lambert–Gustavsson action.
[1] His doctoral thesis Matter Couplings in Supergravity Theories was supervised by Edward Witten.
At Johns Hopkins University he became in 1989 a full professor, holding a professorial chair there until 2014.
In 2014 he was appointed director of TRIUMF, Canada's national laboratory for particle and nuclear physics.
[1][3] Bagger's research deals with high-energy physics, supersymmetry, and string theory.