Houston, May 9 (PTI): Vinod Khosla, an Indian-American Silicon Valley venture capitalist, and his wife Neeru are among the latest billionaires to have pledged half of their fortunes to charity either during their lifetime or after death.

Ten families, including the Khoslas, signed the pledge on April 28, bringing the total number of signatories to 69.

Several leading entrepreneurs in the Silicon Valley, among them venture capitalist John Doerr, Oracle CEO Larry Ellison, hedge fund manager Tom Steyer and Facebook founder Mark Zuckerberg, had signed the pledge earlier.

“I am delighted that so many wealthy Americans are taking a public pledge that supports philanthropy,” Warren Buffett, pledge co-founder and the chairperson and CEO of Berkshire Hathaway, said in an April 28 statement.

Khosla, 56, is Silicon Valley’s most prominent ”green” venture capitalist and a known name in the clean-tech community. A co-founder of Sun Microsystems, Khosla was a general partner at Kleiner Perkins Caufield & Byers before striking out on his own with Khosla Ventures in 2004.