The Advanced Photon Source
a U.S. Department of Energy Office of Science User Facility

Stephenson Appointed ALD for Photon Sciences

Argonne National Laboratory Director Eric D. Isaacs announced today that Brian Stephenson has been appointed Associate Laboratory Director (ALD) for Photon Sciences, effective September 1, 2011. The directorate comprises three research and support divisions centered on Argonne’s Advanced Photon Source (APS).


Brian has been interim ALD for Photon Sciences since October 2010, proving his abilities to lead both the directorate and the Advanced Photon Source Upgrade project effort.

He is a recognized and widely known world leader in x-ray science with vast knowledge and expertise in synchrotrons, beamlines, and instrumentation. He received an R&D 100 award for his work on the Hard X-ray Nanoprobe, served on the APS User Steering Committee, and was a critical team member in the development of the initial proposal to upgrade the Advanced Photon Source.

Brian joined Argonne in 1995, serving most recently as Senior Physicist and Group Leader of the Synchrotron Radiation Studies Group in the Materials Science Division, and Director of the Nanoscale Materials Collaborative Access Team at the APS.

Previously, he worked at IBM’s T.J Watson Research Center, first as a research staff member, then as manager of the Statistical Physics Group. From 1987 to 1995, he was spokesperson for the IBM-MIT Participating Research Group at the National Synchrotron Light Source. From 1990-1994, he led the IBM-MIT-McGill Collaborative Access Team at the APS.

Brian is the co-author of more than 140 publications. He is a fellow of the American Physical Society and was chair the X-ray Science Gordon Research Conference.

The Advanced Photon Source at Argonne National Laboratory is one of five national synchrotron radiation light sources supported by the U.S. Department of Energy’s Office of Science to carry out applied and basic research to understand, predict, and ultimately control matter and energy at the electronic, atomic, and molecular levels, provide the foundations for new energy technologies, and support DOE missions in energy, environment, and national security. To learn more about the Office of Science x-ray user facilities, visit

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