He also won the ACM Software System Award for his contributions to Interlisp
. A celebration of his life was held on june 5 at the Palo Alto Research Center in Palo Alto, California.
, a version of LISP which contains a large number of prepackaged routines is an example of programming environment.
Mostow and Cohen  discuss issues for speeding up Interlisp
programs by caching in the presence of side effects.
We once attended a panel session at Xerox PARC on three great programming environments: InterLisp
, Smalltalk, and Cedar.
He built a software team including Dan Murphy and Alice Hartley, collaborating to produce an expanding series of Lisp implementations leading to Interlisp
. Meeting the challenges of developing very large (for the day) systems on computers with minuscule main memory, he led them to push the state of the art in virtual memory and operating systems, going from software to hardware paging, eventually producing TENEX.
Kaplan, research fellow, Information Sciences and Technologies Laboratory, Xerox Palo Alto Research Center; Larry Masinter, Xerox Palo Alto Research Center, and Warren Teitelman, vice president of engineering, Lucid, Inc., for "their pioneering work in programming environments that integrated source-language debuggers, fully compatible integrated interpreter/compiler, automatic change management, structure-based editing, logging facilities, interactive graphics, and analysis/profiling tools in the Interlisp
He went on to become one of Silicon Valley's defining figures in artificial intelligence, pioneering numerous systems starting with his doctoral dissertation, STUDENT, and followed by the widely-used programming languages Logo and Interlisp
; the (innovative) operating system TENEX; the knowledge-sharing system Eureka; and more recently, Powerset, the natural language search engine.
One of the few exceptions from this rule was the Do What I Mean (DWIM) feature of the Interlisp
For veterans in the field, it was a poignant and sometimes painful walk through the lightning-fast boom-to-bust period of the 1980s, peppered with talk of InterLisp
, Symbolics machines, and the Gang of Four (Teknowledge, Carnegie Group, IntelliCorp, and Inference.)
We were working with Lisp environments, for example, Interlisp
and the Massachusetts Institute of Technology Lisps and their descendants.
Over the past 30 years a variety of Lisp dialects have been developed, including MacLisp , ZetaLisp , Franz Lisp , Portable Standard Lisp  and InterLisp
 to mention just a few.
reference manual, Bolt, Beranek and Newman, 1974.