Rajeev Motwani, the Indian-American computer science professor at Stanford University who mentored Google‘s co-founders Larry Page and Sergey Brin when they were graduate students, has died in a swimming pool accident at his Atherton, California home. He drowned Friday morning in a backyard swimming pool at the home, said the San Jose Mercury News. Though paramedics were called when his body was found, and he was pronounced dead at the scene at 12.28 p.m.

Born March 26, 1962, in Jammu, Motwani grew up in New Delhi, earned a computer science degree from the Indian Institute of Technology (IIT), Kanpur in 1983, and his doctorate from the University of California-Berkeley in 1988. As a Stanford professor, he also served as the director of graduate studies for the computer science department and founded the Mining Data at Stanford project (MIDAS).

Motwani was well known for his research in theoretical computer science and was a winner of the Godel Prize in 2001 for his work on the PCP theorem and its applications to hardness of approximation. His work had a major impact on the field of algorithms, and he used his knowledge of that field to develop methods for searching almost infinite archives of data by randomly selecting subsets of the data. It was in the field of data mining that he made some of his seminal contributions. The field is the basis of much of modern Internet commerce and the operation of search engines such as Google.

Motwani co-authored two widely-used theoretical computer science textbooks, Randomized Algorithms with Prabhakar Raghavan (Cambridge University Press 1995, ISBN 978-0521474658) and Introduction to Automata Theory, Languages, and Computation with John Hopcroft and Jeffrey Ullman (2nd ed., Addison-Wesley, 2000).

Motwani helped many Valley startups gain a foothold, but none so famous as Google, whose cofounder Sergey Brin mourned him Saturday. “I want him to really be remembered well. It’s a rare combination to have somebody who is so smart and also such a nice guy,” Brin told Mercury News on the phone.

Motwani, he added, “had a lot of interest in computer science theory. He’s primarily a theoretician, and it’s incredible the amount of impact he has had directly on products and companies.”

The news of Motwani’s death struck like a thunderclap in Silicon Valley. Blogs, Facebook pages and Twitter communications were filled with testimonials to a brilliant, kind man who was never too busy to help a budding entrepreneur or struggling graduate student.

Motwani is survived by his wife Asha Jadeja and daughters Naitri and Anya. The family will hold a private funeral, according to the university’s news agency, but a memorial service will be held at a later date.