Cees de Groot has published The Genius Of Lisp, a technical history book that fills a gap in computer literature by combining historical narrative with extensive code examples. The book, published by Berksoft Publications, took five years to complete and represents one of the few computer history works that balances storytelling with technical depth.

De Groot, who describes himself as 'a Lisp-er' and has used Common Lisp extensively in his Emacs development work, wrote the book because he couldn't find existing works that combined historical context with the technical details he sought. The book includes contributions from Richard P. Gabriel and features personal memories from Dick Gabriel about Lisp's creator John McCarthy.

Available in multiple formats including ebook and paperback through Lulu, Amazon, and Kobo, the book comes with source code downloads and a clickable bibliography. De Groot plans to write more technical history books, potentially on Smalltalk or computer networks, though likely only after retirement from his full-time job. The author welcomes feedback through IRC, Mastodon, and Lemmy, and is considering setting up a Discourse forum if interest warrants.