He is almost an old geezer who never touched a Symbolics machine (or a Xerox or a TI). However, has been fond of MCL and CMUCL.
You can find out a little more about him at the Data and Computational Biology site and on Linkedin.
Some Common Lisp things he did include some code in the CLOCC, maintaining MK-DEFSYSTEM and several other libraries. His (within-parens) blog is a good place to keep up with them.