Tesla Motors was incorporated in July 2003 by Martin Eberhard and Marc Tarpenning, who financed the company until the Series A round of funding. Both men played active roles in the company's early development prior to Elon Musk's involvement.[25][26] Musk led the Series A round of investment in February 2004, joining Tesla's Board of Directors as its Chairman. Tesla's primary goal was to commercialize electric vehicles, starting with a premium sports car aimed at early adopters and then moving as rapidly as possible into more mainstream vehicles, including sedans and affordable compacts.