| Jan Kowalski | Christopher Williams | 
| Geburtsdatum | 01.01.1983 | 
| Nationalität | American | 
| Weltraumagentur | National Aeronautics and Space Administration (NASA) | 
| Status | Schulung | 
| Astronautentyp | Staatliche Agentur | 
| Wikipedia | https://en.wikipedia.org/wiki/Christopher_Williams | 
Christopher Williams grw up in Potomac, Maryland and graduated from Stanford University in 2005 with a bachelor’s degree in physics and a doctorate in physics from MIT in 2012, where his research was in astrophysics. Williams is a board-certified medical physicist, completing his residency training at Harvard Medical School before joining the faculty as a clinical physicist and researcher. He most recently worked as a medical physicist in the Radiation Oncology Department at the Brigham and Women's Hospital and Dana-Farber Cancer Institute in Boston. He was the lead physicist for the Institute’s MRI-guided adaptive radiation therapy program. His research focused on developing image guidance techniques for cancer treatments. Exact date of birth unknown.