U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Physical Measurement Laboratory

Time and Frequency Division

Time and Frequency Division Staff

Time and Frequency - HQ
Name Phone Number Staff Type
Elizabeth Donley (303) 497-5173 Fed
Morgan Falls (303) 497-7515 Fed
Archita Hati (303) 497-5629 Fed
Judah Levine (303) 497-3903 Fed
Angela Liefer (303) 497-3276 Fed
Kelsey Light (303) 497-3986 Fed
Aidan Montare Fed
Petrina Potts (303) 497-3958 Fed
Kelsey Rodriguez (303) 497-5398 Fed
Katy Stephenson (303) 497-3149 Fed

Ion Storage Group
Name Phone Number Staff Type
Matthew Affolter (303) 497-4038 Fed
James C. Bergquist (303) 497-5459 Assoc
Matthew Bohman Assoc
John J. Bollinger (303) 497-5861 Fed
Kevin Boyce (303) 497-6448 Assoc
Adam Brandt (303) 497-4939 Assoc
Samuel M. Brewer (303) 497-6448 Assoc
Margaret Bruff (303) 497-4213 Assoc
Bryce Bullock (303) 497-4516 Assoc
Allison Carter (303) 497-4560 Fed
Dalton Chaffee (303) 497-6199 Assoc
Chin-wen Chou (303) 497-3987 Fed
Ethan Clements (303) 497-4878 Assoc
Alejandra Collopy (303) 497-4703 Fed
Mohamad Contractor (303) 497-5145 IntlAssoc
Kaitlyn David (303) 497-5398 Assoc
Robert Drullinger (303) 497-3183 Assoc
Zhexuan Gong Assoc
Panyu Hou (303) 497-7295 IntlAssoc
David Hume (303) 497-4364 Fed
George Iskander Assoc
Wayne M. Itano (303) 497-5632 Assoc
May Kim Assoc
Hannah Knaack (303) 497-3597 Assoc
Dietrich Leibfried (303) 497-7880 Fed
David Leibrandt (303) 497-7292 Fed
Jennifer Lilieholm (303) 497-4214 Assoc
Yu Liu IntlAssoc
Zhimin Liu (303) 497-3845 IntlAssoc
Nathan Lysne (303) 497-5783 Assoc
Mason Marshall (303) 497-3534 Fed
Kyle McKay (303) 497-6298 Assoc
Justin Niedermeyer (303) 497-3433 Assoc
Sayan Patra IntlAssoc
April Reisenfeld (303) 497-5798 Assoc
Julian Schmidt (303) 497-3534 IntlAssoc
Daniel Slichter (303) 497-7376 Fed
Laurent Stephenson (303) 497-4149 IntlAssoc
Jules Stuart (303) 497-5145 Fed
Jose Valencia (303) 497-6319 Assoc
David J. Wineland (303) 497-5286 Assoc
Jenny Wu (303) 497-4578 IntlAssoc
Giorgio Zarantonello (303) 497-4446 IntlAssoc

Time and Frequency Metrology Group
Name Phone Number Staff Type
David A. Howe (303) 497-3277 Assoc
Connor Humiston (303) 497-7961 Assoc
John Lettang (303) 497-7961 Assoc
Craig Nelson (303) 497-7961 Fed
Marco Pomponio (303) 497-5510 IntlAssoc

Time Realization and Distribution Group
Name Phone Number Staff Type
Ladan Arissian (303) 497-3639 Fed
Neil Ashby (303) 497-4395 Assoc
Roger Brown (303) 497-6971 Fed
John Daly Ctr
Guilherme De Andrade Garcia (303) 497-4271 Assoc
Matthew J. Deutch (303) 497-3914 Fed
Chris Fujita (808) 335-4361 Fed
Vladislav Gerginov (303) 497-7366 Assoc
Gregory Hoth (303) 497-4414 Fed
Michael A. Lombardi (303) 497-3212 Fed
John P. Lowe (303) 497-5453 Assoc
Lara Minichiello Assoc
Leroy Moy Ctr
Glenn Nelson (303) 497-3914 Fed
Vickie Nolting Assoc
Andrew Novick (303) 497-3378 Fed
Adela Mae Ochinang (808) 335-4361 Fed
Dean Okayama (808) 335-4361 Fed
Tom Parker (303) 497-7881 Assoc
Bijunath Patla (303) 497-4082 Fed
Jeffrey Sherman (303) 497-3511 Fed
James Spicer (303) 497-5306 Fed
Shauna Sutton Assoc
Dean Takamatsu (808) 335-4361 Fed
William Yates (303) 497-3914 Fed

Optical Frequency Measurements Group
Name Phone Number Staff Type
Kyle Beloy (303) 497-4112 Fed
Jennifer Black (303) 497-5613 Fed
Tobias Bothwell Assoc
Wesley Brand Assoc
Travis Briles (303) 497-6049 Fed
Grant Brodnik (303) 497-3822 Assoc
David Carlson (303) 497-5062 Assoc
Kristina Chang (303) 497-4336 Fed
Peter Chang (303) 497-7459 Assoc
Chun Chia Chen (303) 497-6801 IntlAssoc
Ryan Cole (303) 497-4692 Assoc
Scott Diddams (303) 497-7459 Fed
Scott Egbert (303) 497-7459 Assoc
James Erikson (303) 497-3822 Assoc
Robert Fasano (303) 497-5782 Assoc
Andrew Ferdinand (303) 497-5192 Assoc
Tara Fortier (303) 497-4686 Fed
Richard Fox (303) 497-3478 Fed
Connor Fredrick (303) 497-3655 Assoc
Tanner Grogan (303) 497-6680 Assoc
William Groman (303) 497-7459 Assoc
Youssef Hassan (303) 497-3463 IntlAssoc
Nazanin Hoghooghi (303) 497-7459 Assoc
Jason Horng (303) 497-6240 Fed
Sindhu Jammi (303) 497-4980 IntlAssoc
Yan Jin (303) 497-3822 IntlAssoc
Megan Kelleher (303) 497-7969 Assoc
Lauren Kennedy (303) 497-7459 Assoc
Igor Kudelin (303) 497-7459 IntlAssoc
Dahyeon Lee (303) 497-4580 IntlAssoc
Daniel Lesko (303) 497-6701 Assoc
Alexander Lind (303) 497-4045 Assoc
Yifan Liu (303) 497-4580 IntlAssoc
Haixin Liu IntlAssoc
Andrew Ludlow (303) 497-4972 Fed
Charles McLemore (303) 497-5072 Assoc
Aria Mundy Assoc
Nicholas Nardelli (303) 497-5829 Assoc
Zachary Newman (303) 497-4876 Assoc
Chris Oates (303) 497-7654 Fed
Scott Papp (303) 497-3822 Fed
Franklyn Quinlan (303) 497-4580 Fed
William Schenken (303) 497-7459 Assoc
Pooja Sekhar (303) 497-7377 IntlAssoc
Jacob Siegel (303) 497-4877 Assoc
Gregory Spektor (303) 497-3551 IntlAssoc
Stephanie Swartz (303) 497-7377 Fed
Eugene Tsao (303) 497-0000 Assoc
Tsung Han Wu (303) 497-7377 Assoc
Jizhao Zang (303) 497-3302 IntlAssoc

Atomic Devices & Instrumentation Group
Name Phone Number Staff Type
Yorick Andeweg (303) 497-4780 Assoc
Douglas Bopp (303) 497-3540 Assoc
Hsi Jan Isaac Fan IntlAssoc
Tom Heavner (303) 497-7654 Fed
Matthew Hummon (303) 497-4780 Fed
Seji Kang (303) 497-3334 IntlAssoc
John Kitching (303) 497-4083 Fed
Jesse Kruse Assoc
Yang Li IntlAssoc
Gabriela Martinez (303) 497-4040 Assoc
William McGehee (303) 497-4779 Fed
Safra Niyaz (303) 497-5560 IntlAssoc
Wes Pollock (303) 497-3437 Assoc
Daniel Rodriguez Castillo Assoc
Susan Schima (303) 497-7213 Fed
Alexander Staron (303) 497-4779 Assoc
Konrad Ziegler Assoc