Jack of All Trades, Master of None

A business colleague whom I met at a SoL gathering emailed asking if I or anyone I knew would be qualified and interested in presenting his seminar for 5-7 days in May and June. I sent a bio, CV, and selected projects list. The response (in part):

Wow! Talk about diversity! Clearly you are virtually undefinable.

Taking it as a compliment, I asked if I could use his quote in my media kit. What the heck – if people can’t figure out what you do, you can at least have good marketing.
Question: Correct use of ‘whom’ in the first sentence? Answer: Yes. Details in the comments.