| Clue | Source | Date |
|---|---|---|
| Hawking collaborator | Wall Street Journal | 26 Dec 2020 |
| Physicist collaborator of Hawking | Newsday | 25 Mar 2017 |
| British mathematician Roger | Wall Street Journal | 09 Feb 2015 |
| Mathematician Roger | ||
| Mathematical physicist Roger | ||
| Physicist collaborator of Escher and Hawking | ||
| Stephen Hawking colleague | ||
| Politician of 50 years ago. |