If you're not, that's not all you do, or you do it at more than one place, I tend to think "I invest in young businesses" opens some doors and is fairly accurat

If you're not, that's not all you do, or you do it at more than one place, I tend to think "I invest in young businesses" opens some doors and is fairly accurate whether your investment is time, energy, money, or a combination. If you don't have the energy or the motivation to really get into it, "I am a (financial|management|technology|legal|PR)? consultant" is an easy out.