I've been an enthusiastic Common Lisp implementor, developer and advocate for over 25 years, in particular with ten years at Harlequin and more recently as a consultant for Ravenbrook. I've worked with various lisps on a range of projects, from servers and GUI applications down to the LispWorks garbage collector. Most of the software I've written doesn't belong to me and so I can't publish it, but you'll find links to some of the libraries I've worked on here, along with a few papers that I've authored.
My full CV is here.
Working with Ravenbrook makes me part of a team. We're highly qualified mathematicians and computer scientists, we have a lot of lisp experience, and between us we can cover a lot of ground. So if what you need is (for instance) a temporary need for more weight on one of your projects, please come to us. If we can't help then we'll put you in touch with people who can.