Jeff joined Google in 1999 and is a Google Fellow. He has worked on a
variety of systems at Google, including MapReduce, BigTable, Spanner,
five generations of Google's crawling, indexing, and query serving
systems, Google's initial advertising system, Google Translate,
AdSense for Content, Google News, and has designed and implemented
many of Google's low-level software libraries and developer tools.
More recently he has been working on large-scale machine learning
systems for supervised and unsupervised learning.