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

User Administration

From on-site phones, dial 2 and the last four numbers listed below.

Location: Building 401, ground floor (left of elevators)

Office hours: 8:30 a.m. - 5:00 p.m., M-F

General inquiries:; phone: 630-252-9090; fax: 630-252-9250


Susan White-DePace

Constance Vanni

Jacki Flood

Jessi Krzemien

Alyssa Lehocky

  • User Office Administrative Assistant
  • Phone: 630-252-3135
  • Email:

Beverly Knott

Melanie Matula Rebecca Sikes
  • Foreign visits and assignments
  •  Phone: 630-252-7858
  •  Email:

Lauren Ambrose
Mailing Address
  • Advanced Photon Source
    Argonne National Laboratory
    9700 S. Cass Avenue
    Building 401
    Lemont, IL 60439



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