She recognizes that if she is to eventually step out of the business, her son needs to be fully involved even during the start up phase.

FORBES: It's All in the Family: Sons and Moms in Business Together

Here are five reasons that working from home is appealing, especially for companies in the start-up phase.

FORBES: 5 Reasons to Love Working From Home

That figure represents an extraordinary scaling of Twitter, a company that is not much beyond start-up phase.

FORBES: Six Ways to Embrace A Low Paid Future

Especially in start-up phase, every member of the team has to take care of his or her own responsibilities first, otherwise success is unlikely.

FORBES: How the Broncos Playoff Loss Compares to Running a Start-Up

He also went into some detail about his policy of not paying dividends to shareholders - a practice deemed normal by any other business that has moved beyond the start-up phase.

BBC: Warren Buffett

The start-up phase went very well.

UNESCO: Navigator St��ve Ravussin deploys Argo float in the Atlantic | United Nations Educational, Scientific and Cultural Organization

While he enjoys the early phase of building a start-up, he is less enamored of running a large company, he said.

WSJ: Tumblr's President Resigns

As for the Range Fuels plant, construction of phase one in Soperton, GA, is about 85% complete, with start-up planned for mid-2010.

FORBES: Diminishing Expectations from Range Fuels