Jerry Neumann
Early-stage investor: http://neuvc.com
I'm pretty deep in a specific area (take a look at the companies I've invested in and worked at) so I can vet ideas, talk about how things fit into the ecosystem, suggest and introduce potential partners, etc. That's probably my unique value-add, but I've been investing for a while, so I can do the standard investor stuff: business model, hiring, financial, etc.