SurveyMonkey CEO Dave Goldberg has died suddenly at the age of 47, his family announced.

A Silicon Valley entrepreneur and husband of Facebook COO Sheryl Sandberg, David Goldberg was a former Yahoo executive before joining SurveyMonkey in 2009.

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Dave Goldberg expanded the online survey company leading to a valuation of $2 billion, the Wall Street Journal says.

Facebook founder Mark Zuckerberg described Dave Goldberg as “an amazing person”.

News of Dave Goldberg’s death was posted on Facebook by his brother, Robert.

Robert Goldberg wrote: “It’s with incredible shock and sadness that I’m letting our friends and family know that my amazing brother, Dave Goldberg, beloved husband of Sheryl Sandberg, father of two wonderful children, and son of Paula Goldberg, passed away suddenly last night.”

Under Dave Goldberg, SurveyMonkey grew from a handful of employees to more than 450 and acquired 25 million customers.

Dave Goldberg’s fortunes was closely linked to those of Silicon Valley – a media company founded by him, Launch Media, was taken over by Yahoo in 2001, just after the “dotcom bubble” burst.