I'm just finishing up a biography of Frank Whittle; he really was incredibly clever about shapes like turbine blades, specialised alloys, and a very ethical yet focussed man.

Feynman was a physicist's physicist. Very sharp, a bit of a mischievous lad, especially in social dealings.

Hawking would almost be expected, hence the mention.

As far as the ones I made up (and yet to be born), Ian Allan Hobbes should have been a clue as to their being purely fictitious, the name derived from Ian Allan the famous publisher of railway books and Hobbes the Cat. Grin!