In 1993, Marc joined
Digital Equipment Corporation which was later merged with
Compaq. One of his contributions was to Mercator, an extendable, Java-based, high-performance web crawler which was integrated into
AltaVista in 2001. Marc Najork and Marc Brown were the main contributors to JCAT, a Java-based algorithm animation system with classroom applications.
Luca Cardelli developed
Obliq, which Marc used to make Obliq-3D, a fast-turnaround 3D animation system. In 2001, he joined
Microsoft Research Silicon Valley. He contributed to Boxwood, a distributed, scalable
B-tree which serves as a foundation for storage infrastructure. The creation of PageTurner, with Dennis Fetterly and Mark Manasse, was designed to study the evolution of webpages. They also found that past behavior of changes in websites was indicative of future changes on that site. Further study of the data showed that statistical anomalies were a good predictor of spam, which led Microsoft to file a patent later used by
Microsoft Bing. Marc also developed the Scalable Hyperlink Store, which is a scalable, fault-tolerant, and incrementally updateable database for storing large portions of a
webgraph in memory. He joined the Personal Search Infrastructure team at
Google in 2014 where he worked on HappyHour, a processing and serving system for structured personal data. He then became a senior director of research engineering at
Google Research where he managed a team advancing the state of the art in information retrieval. Marc then became a distinguished research scientist at
Google Deepmind where he works on
generative artificial intelligence. ==Honors and fellowships==