Clozure Associates operated between the years 2000 and 2021. Its goals included providing high quality Common Lisp consulting services, and advancing our own implementation of the language, Clozure Common Lisp.

Our successful consulting projects ranged from award-winning desktop applications to large-scale web services and advanced scientific computing tools. We also incubated Learning Touch, an iPhone app company which is still in operation.

Clozure developed and maintained Clozure CL (CCL), a world-class implementation of Common Lisp running on Linux, Mac OS X, Microsoft Windows, FreeBSD, and other operating systems targeting Intel and ARM processors. CCL is open-sourced, and can be found on GitHub. It is currently being maintained by R. Matthew Emerson.

Clozure was run by its four partners: Gary Byers, Gail Zacharias, Jeremy Jones, and Andrew Shalit. We employed a large number of Common Lisp programmers over the years. We thank them for their help contributing to Clozure’s success and Common Lisp’s endurance.