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

User Administration

Due to the COVID-19 pandemic, all APS User Office staff are teleworking. Staff are available via e-mail during normal office hours.
Please use e-mail for all communications while teleworking is in place.

General inquiries:

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


Susan White-DePace

  • Manager, User Programs
  • Phone: 630-252-7172
  • Email:

Constance Vanni

  • Assistant Manager, User Programs
  • Phone: 630-252-0909
  • Email:

Jacki Flood

Jessi Krzemien

Kim Toerpe

Beverly Knott

Lauren Ambrose
  •  Financial user accounts
  •  Phone: 630-252-1244
  •  Fax: 630-252-9250
  •  Email:
Rebecca Sikes
  • Foreign visits and assignments
  •  Phone: 630-252-7858
  •  Email:

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



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