Eric Kotani, the pseudonym that astrophysicist Yoji Kondo uses for his fiction writing.
Astrophysicist and Aikido & Judo instructor, Yoji Kondo! I have been thrown around by Dr Kondo. It was like 25 years ago, and I didn't know who I was dealing with until I saw the Heinlein Requiem book a couple years later. A missed opportunity!