Entrepreneur Allan Lim believes in aligning his investments with what he does best.
That is why the chief executive and co-founder of Alpha Biofuels, which makes biodiesel from waste cooking oil, is big on green and sustainable businesses.
He put at least $200,000 into his biofuel business with his friends in 2008. The company has seen steady growth, with revenue of between $1.5 million and $2 million in the past few years.
Mr Lim, 40, said: "When it comes to long-term issues, I think about how to grow a company, how to create technologies, how to create visions for the future."
But the civil and structural engineering graduate confessed that he isn't the most savvy of investors.
"I don't think about what shares I'm going to buy. I don't understand those price-earnings ratios," he said.
Last year, the investor co-founded social enterprise The Living! Project, which is involved in various efforts such as developing an upcoming rooftop farm.
He hopes to plough about 20 per cent of the farm's profits into social investments, with the aim of hiring people who are marginalised. The champion of environmental and social causes used to be a diving instructor. He is married to Ms Dixie Wu, 40, a production manager for an animation company. They have no children.