Alas no. I read a range of sci-fi but am not aware of other authors who write such amazing speculative fiction. He really takes sci-fi ideas to unpredictable yet believable conclusions. It is real hard sci-fi.

If you do discover similar authors, please let me know.

Recommended reading:

All his short stories are amazing. I'd highly recommend them:

http://www.amazon.com/Luminous-Greg-Egan-ebook/dp/B00E84BABW

http://www.amazon.com/Axiomatic-Greg-Egan-ebook/dp/B00FDWOBZ...

Some of his novels are hit and miss, but certainly worth checking out. This is probably my favourite:

http://www.amazon.com/Permutation-City-Greg-Egan-ebook/dp/B0...

This reminds me of Greg Egan's short story "The Hundred Light-Year Diary". The text is at [1] but better still buy the book [2]

[1] http://pastebin.com/f341e113e [2] http://www.amazon.co.uk/Axiomatic-Greg-Egan/dp/0575081740

Greg Egan is my favorite sci-fi writer. Read http://www.amazon.com/Axiomatic-Greg-Egan/dp/0061052655 and have your mind blown.