From 1986-88, I worked for Xerox AI Systems, the group that commercialized Interlisp-D. We(my personal contribution was relatively small) added Common Lisp to the system, along with SEdit, a friendlier-than-DEdit structure editor.

Interlisp-D went against the grain of most other Lisp implementations at the time:

* Byte-coded implementation interpreted in micro-code, for very compact compiled code (vs. RISC machines' larger, faster code)

* Tuned for interactive performance (vs. tuned for Gabriel benchmark performance)

* Managed code and structure editing (vs. text files and emacs)

In late 1988, Xerox tried to spin the Lisp/AI business out into a separate company named enVos. Envos crashed almost immediately:

http://www.the-scientist.com/?articles.view/articleNo/10590/...

Medley, the last release from enVos, hung on as a commercial product from Venue:

http://top2bottom.net/medley.html