Marc has been involved in online systems since 1993, when he founded a BBS-based commercial real estate system. He has worked and consulted for pioneering Internet firms including CarsDirect.com and Physicians Online. He has co founded four startups, two of which currently are active and profitable – ExposureManager.com and Pajamas Media. Marc has a focus in participatory and emergent media, and has advised clients including Fast Company and Inc. magazines, United Health, and Veterinary Pet Insurance on the value of participatory media, and on strategies for creating and maintaining participatory media sites.