Gregor Kiczales led the PARC teams that developed aspect-oriented programming and AspectJ.

Gregor is an author, speaker and trainer on aspect-oriented programming (AOP), including adopting and using AOP technology, expected business value, and expected future developments of the technology.

He was president of the Aspect-Oriented Software Association from 2003 to 2005, served as program chair of its annual conference in 2002, and on the program committee from 2003 through 2006.

In 2001, his work on AOP was profiled as one of "Ten Emerging Technologies that Will Change the World." in MIT Technology Review. In 2002, in recognition of his work on AOP, he was a finalist for the 2002 World Technology Network Awards. The AspectJ project itself won a JavaWorld Editor's choice award in 2003 and a Jolt Productivity Award in 2004.

He has 20 years of experience in designing, implementing and delivering new programming language technologies. He was a member of the Common Lisp Object System (CLOS) design team and the implementer of PCL, a high-performance portable implementation of CLOS that formed the basis of subsequent commercial implementations. He was the lead designer of the CLOS metaobject protocol, and author, with Jim des Rivieres and Danny Bobrow of The Art of the Metaobject Protocol (MIT Press, 1991).