The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.
The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.
Time and Frequency Division Staff
| Name | Phone Number |
|---|---|
| Douglas Bopp | (303) 497-3540 |
| Joseph Christesen | (303) 497-6052 |
| Azure Hansen | (303) 497-3370 |
| Tom Heavner | (303) 497-5015 |
| Matthew Hummon | (303) 497-4780 |
| John Kitching | (303) 497-4083 |
| Gabriela Martinez | (303) 497-4040 |
| Safra Niyaz | (303) 497-2632 |
| Wes Pollock | (303) 497-3437 |
| Susan Schima | (303) 497-7213 |
| Carson Teale | (303) 497-5924 |
| Name | Phone Number |
|---|---|
| Victor Zhang | (303) 497-3977 |
| Name | Phone Number |
|---|---|
| Matthew Affolter | (303) 497-4038 |
| James C. Bergquist | (303) 497-5459 |
| John J. Bollinger | (303) 497-5861 |
| Kevin Boyce | (303) 497-6448 |
| Samuel M. Brewer | (303) 497-6448 |
| Shaun Burd | (303) 497-5783 |
| Dalton Chaffee | (303) 497-6199 |
| Chin-wen Chou | (303) 497-3987 |
| Ethan Clements | (303) 497-4878 |
| Daniel Cole | (303) 497-4685 |
| Alejandra Collopy | (303) 497-4703 |
| Jacob Cook | (303) 497-7292 |
| Kaifeng Cui | (303) 497-3534 |
| Robert E. Drullinger | (303) 497-3183 |
| Stephen Erickson | (303) 497-4446 |
| Kevin Gilmore | (303) 497-4214 |
| Zhexuan Gong | |
| Panyu Hou | (303) 497-7295 |
| David Hume | (303) 497-4364 |
| Wayne M. Itano | (303) 497-5632 |
| Elena Jordan | (303) 497-7415 |
| May Kim | (303) 497-5798 |
| Hannah Knaack | (303) 497-3597 |
| Felix Knollmann | (303) 497-4213 |
| Dietrich Leibfried | (303) 497-7880 |
| David Leibrandt | (303) 497-7292 |
| Justin Niedermeyer | (303) 497-3433 |
| Daniel Slichter | (303) 497-7376 |
| Raghavendra Srinivas | (303) 497-4516 |
| Robert Sutherland | |
| Susanna Todaro | (303) 497-3845 |
| Jose Valencia | (303) 497-6319 |
| Andrew C. Wilson | (303) 497-6144 |
| David J. Wineland | (303) 497-5286 |
| Jenny Wu | (303) 497-4578 |
| Name | Phone Number |
|---|---|
| Pablo Acedo-Gallardo | (303) 497-3546 |
| Kyle Beloy | (303) 497-4112 |
| Jennifer Black | (303) 497-5613 |
| Wesley Brand | (303) 497-6592 |
| Travis Briles | (303) 497-6049 |
| Flavio Caldas da Cruz | (303) 497-6054 |
| David Carlson | (303) 497-5062 |
| Yun Jhih Chen | (303) 497-4877 |
| Scott Diddams | (303) 497-7459 |
| Tara Drake | |
| Robert Fasano | (303) 497-5782 |
| Tara Fortier | (303) 497-4686 |
| Richard Fox | (303) 497-3478 |
| Connor Fredrick | (303) 497-3655 |
| Thomas Gray | |
| Youssef Hassan | (303) 497-3463 |
| James Hendrie | (303) 497-3570 |
| Megan Kelleher | (303) 497-7969 |
| Kyle Kelly | |
| Abijith Kowligy | (303) 497-6124 |
| Kieran LaMee | |
| Dahyeon Lee | (303) 497-4580 |
| Daniel Lesko | (303) 497-6701 |
| Alexander Lind | (303) 497-4045 |
| Andrew Ludlow | (303) 497-4972 |
| William McGrew | (303) 497-6680 |
| Charles McLemore | (303) 497-0000 |
| Takuma Nakamura | (303) 497-3437 |
| Nicholas Nardelli | (303) 497-5829 |
| Zachary Newman | (303) 497-4876 |
| Daniele Nicolodi | (303) 497-6801 |
| Jun Nishida | |
| Chris Oates | (303) 497-7654 |
| Scott Papp | (303) 497-3822 |
| Franklyn Quinlan | (303) 497-4580 |
| Gregory Spektor | (303) 497-3551 |
| Jordan Stone | (303) 497-5192 |
| Sida Xing | (303) 497-4336 |
| Su-Peng Yu | (303) 497-5266 |
| Jizhao Zang | (303) 497-3302 |
| Xiaogang Zhang | (303) 497-3411 |
| Name | Phone Number |
|---|---|
| Elizabeth Donley | (303) 497-5173 |
| Morgan Falls | (303) 497-7515 |
| Archita Hati | (303) 497-5629 |
| David A. Howe | (303) 497-3277 |
| Judah Levine | (303) 497-3903 |
| Angela Liefer | (303) 497-3276 |
| Kelsey Light | (303) 497-3986 |
| Craig Nelson | (303) 497-7961 |
| Petrina Potts | (303) 497-3958 |
| Anne M. Reidy | (303) 497-3149 |
| Kelsey Rodriguez | (303) 497-5398 |
| Jeffrey Sherman | (303) 497-3511 |
| Katy Stephenson | (303) 497-3295 |
| Brian Washburn | (303) 497-6110 |
| Name | Phone Number |
|---|---|
| Marco Pomponio | (303) 497-5510 |
| Mary Wilkins |
| Name | Phone Number |
|---|---|
| Neil Ashby | (303) 497-4395 |
| Alessandro Banducci | (303) 497-5668 |
| John Daly | |
| Matthew J. Deutch | (303) 497-3914 |
| Chris Fujita | (808) 335-4361 |
| Vladislav Gerginov | (303) 497-7366 |
| Michael A. Lombardi | (303) 497-3212 |
| John P. Lowe | (303) 497-5453 |
| Avalon McFarland | |
| Lara Minichiello | |
| Peter Mitchell | |
| Leroy Moy | |
| Glenn Nelson | (303) 497-3914 |
| Vickie Nolting | |
| Andrew Novick | (303) 497-3378 |
| Adela Mae Ochinang | (808) 335-4361 |
| Dean Okayama | (808) 335-4361 |
| Tom Parker | (303) 497-7881 |
| Bijunath Patla | (303) 497-4082 |
| Alexander Radnaev | (303) 497-5668 |
| Jon Shirley | (303) 497-3125 |
| James Spicer | (303) 497-5306 |
| Shauna Sutton | |
| Douglas Sutton | (303) 497-3914 |
| Dean Takamatsu | (808) 335-4361 |
| Snydni Vork | |
| Jian Yao | (303) 497-4721 |
| William Yates | (303) 497-3914 |