| Name - First (Maiden) Last | Credential | Cert Number | Issue Date | Expiration Date |
|---|---|---|---|---|
| Ocean Goins | R. EEG T. | 7762 | 2020-11-18 | 2025-12-31 |
| Octavia Pinckney | R. EEG T. | 5311 | 2014-04-12 | 2029-12-31 |
| Octavio Calderon | R. EP T. | 1052 | 2010-04-24 | 2030-12-31 |
| Octavio Calderon | CNIM | 2101 | 2011-02-26 | 2026-12-31 |
| ODALYS DELGADO | R. EEG T. | 1329 | 1983-07-16 | 2023-12-31 |
| Odalys Cubillo | R. EEG T. | 8325 | 2022-03-07 | 2027-12-31 |
| Ohanian, Krekory | R.NCS.T. | 800 | 2008-01-12 | Lifetime |
| OKSANA PAWLYK | R. EEG T. | 1764 | 1987-11-21 | 2023-12-31 |
| Oksana Ayvazyan | R. EEG T. | 9072 | 2024-05-31 | 2029-12-31 |
| Olasimbo Ayannusi | CNIM | 873 | 2005-05-07 | 2015-12-31 |
| Olcott George | R.NCS.T. | 31 | 1982-01-10 | Lifetime |
| Oldner, Karen S. | R.NCS.T. | 303 | 1997-01-09 | Lifetime |
| Oleg Kotsovsky | CNIM | 687 | 2003-10-04 | 2028-12-31 |
| Oleg Modik | CNIM | 2267 | 2011-08-13 | 2026-12-31 |
| Olesya Craven | CNIM | 3017 | 2014-09-20 | 2029-12-31 |
| Olesya Pokotska | R. EEG T. | 5631 | 2015-06-20 | 2030-12-31 |
| Olesya Pokotska | CLTM | 484 | 2020-07-15 | 2030-12-31 |
| Olga Belyakina | R. EEG T. | 3796 | 2004-11-07 | 2029-12-31 |
| OLGA STOKAN | R. EP T. | 269 | 1990-08-25 | 2023-12-31 |
| Olga Griaznova | CNIM | 1047 | 2006-05-06 | 2026-12-31 |
| Olga Belyakina | CNIM | 1215 | 2007-05-19 | 2027-12-31 |
| Olga Lytvynova | R. EEG T. | 5403 | 2014-09-20 | 2024-12-31 |
| Olga Bohall | R. EEG T. | 5552 | 2015-03-21 | 2025-12-31 |
| Olga Blashchak | R. EEG T. | 5647 | 2015-06-20 | 2025-12-31 |
| Olga Voyetskiy | R. EEG T. | 5997 | 2016-10-29 | 2026-12-31 |