Well, I'll be damned. I'm one of a few.
National Geographic magazine recently published an article titled "Green Dreams" which is about creating alternative fuels from plant sources.
At one point they paraphrase an executive from an alternative energy firm as saying: 'Only perhaps a dozen people on the planet know how to grow algae in high-density systems'. I'd personally put that figure a bit higher, but that's because I'm one of the people who knows how to grow algae in a high-density system.
I even came up with a critical modification that enabled us to grow algae in a closed system without the tank imploding. I'd be on a patent except the company decided to forgo the expense of a patent since at the time nobody else was growing algae (except in their swimming pools and fish tanks).