He is the entrepreneur's entrepreneur and a venture capitalist. He has founded, built up and sold over $100 million in businesses – starting with only a $5,000 car loan.

He is well known for his record sale of the domain name Business.com for $7.5 million which landed him in the Guiness Book of World RecordsTM as the most expensive domain name ever sold.

Business.com was sold again in 2008 for $345 Million which landed Ostrofsky another windfall.

Marc says, "If you can click a mouse, you can make money on the internet."