No not the great s-f author, a Buddhist. Solid lineage credentials (Kalu Rinpoche). Does wonderful translations, and explains the Tibetan systems in a down-to-earth fashion that "brings it home" to the reader.
I'm definitely a Loser, so it seems my Yidam practice should be Awake Loser :)
I've also been reading some Co-Emergent Mahamudra stuff. There's a lineage going back to Saraha and Maitripa which has some very clear pith instructions.
Reading this stuff makes me realise that there's a lot of fun to be had in just doing some of this meditation stuff, so long as you know what you're doing. I think I'd need to start off with simple images - might be worth a try.