NRIs on US Top 400.

It is for the first time that three Indians have made it to the list. Shriram, an early investor in Google, is ranked 258 on the list.
Here is the Details about Him

Rank:258
Net Worth: $1.3 billion
Source: Technology, Google
Age: 49
Marital Status: Married, 2 children
Hometown: Mountain View, CA
Education:

Schooled in Madras, India; created shop bot Junglee. Sold to Amazon in 1998. Later backed tech outfits Yodlee, 24/7 Customer, Plaxo, Zazzle.com. Bubble era taught him to adapt: "Living in a world where everything is changing constantly, you learn to change." Views self as "Sherpa" investor rather than angel because it makes him feel more like a guide than a checkbook. Early investor, board member of Google. Sold $400 million in Google stock at offering, still owns 3.4 million shares worth $960 million.

Other who surprised me is Amar Gopal Bose who is the CEO of BOSE Inc. which I believe the costliest Music systems in the Market, is known for high-end audio equipment and dedication to research.
His details
Rank: 283
Net Worth: $1.2 billion
Source: Manufacturing, Bose
Age: 76
Marital Status: Married, 2 children
Hometown: Framingham, MA
Education: Massachusetts Institute of Technology, Bachelor of Arts / Science
Massachusetts Institute of Technology, Doctorate

Fulbright scholar earned Ph.D. in electrical engineering from MIT, founded Bose Corp. 1964. First contracts with NASA, U.S. military, improving audio communications, but brand built on groundbreaking loudspeaker design. Introduced first factory-installed car stereo system 1982; today a major supplier for high-end automobiles (Porsche, Mercedes). Sales: $1.7 billion. Expanding product line: high-end headphones, wireless home entertainment centers, car-suspension systems
Himself by Bose