Jacobsen is an experimental high-energy physicist and a faculty member at the University of California, Berkeley.
He's a member of the BaBar collaboration, where he lead the effort to create the
reconstruction software and the offline system.
He has previously been a member of the ALEPH (LEP) and MarkII (SLC)
collaborations. His original academic training was in computer engineering,
and he worked in the computing industry before becoming a physicist.