[WJW]

I'd wager that there weren't all that many renaissance men/women back in the day either, but some of the ones that were there are now well known.

In any case, there are plenty of people contributing in a wide array of fields who are alive today. How about Franklin Story Musgraves, who has academic degrees in six different fields, including medicine, computer programming and literature. He also went into space for NASA no less than six times, served in numerous conflicts while he was in the air force, was briefly employed as a mathematician for Kodak, practiced and taught clinical medicine and is/was a consultant for Disney. I found him with the briefest of google searches for "modern renaissance men" :)

https://en.wikipedia.org/wiki/Story_Musgrave