Bernard Gregory (19 January 1919 – 24 December 1977)[1][2][3] was a prominent French physicist and director-general of CERN.

After earning his Ph.D. in 1950 at MIT, under the supervision of Professor Bruno Rossi,[5] Gregory returned to France.

He became known in the high energy physics world in the 1950s when he worked as a researcher, with the title of deputy director, under Professor Leprince- Ringuet at the École Polytechnique.

He directed the work on the 81 cm Saclay Bubble Chamber, developed by the technical services at Saturne for the laboratory of the École Polytechnique, and was subsequently brought to CERN PS in Geneva.

[8] At CERN, he supervised most of the construction of the world's first hadron collider, the Intersecting Storage Rings (ISR).