A Stanford University professor from India who mentored and backed such sparkling and now storied Silicon Valley companies such as Google and Paypal died in a freak drowning accident at his Bay area home on Friday, sending the tech community into gloom. Rajeev Motwani, who was born in Jammu, grew up in Delhi, and graduated from IIT Kanpur, was found in the backyard swimming pool of his Palo Alto home he purchased three years ago. The Times of India reported that there was no official word about the cause of death, but friends and local reports said he did not know how to swim and may have drowned accidentally.