Lucid Incorporated was a Menlo Park, California-based computer software development company.
The first CEO was Tony Slocum, formerly of IntelliCorp; and Gabriel was Lucid's Chief Technical Officer (CTO) and first president.
Eventually Lucid's focus shifted (during the AI Winter) from the Lisp market (which was still growing at this time) to an object-oriented IDE for C++ called "Energize".
Friction arose between the programmers and Stallman, and Lucid forked the software—thus they were primarily responsible for the birth of XEmacs.
[citation needed] The rights to Lucid Common Lisp were sold to Harlequin Ltd. which was bought in 1999 by Global Graphics; Global Graphics then sold the rights to Xanalys Corporation, which spun off LispWorks, the current rights holder which sells Lucid Common Lisp under the "Liquid Common Lisp"[3] label.