Tesla’s first challenge was financing an ambitious idea

Tesla began as a small company trying to solve two problems at once: electric cars had a reputation for being slow, and building a car company required far more money than a clever prototype. Martin Eberhard and Marc Tarpenning founded the company in 2003 around the wager that an electric car could be desirable on its own merits—not merely a compromise for environmentally minded drivers.

Musk entered the story as an investor and board chairman, bringing substantial early funding and influence. That backing helped the company pursue the Roadster, a high-performance electric sports car. The strategy was to start at the expensive end of the market, where buyers might tolerate a new technology’s high cost, then use what the company learned to support broader ambitions. It was a capital-intensive route: Tesla had to develop a battery-powered vehicle while building the organization and production capability to deliver it.

What “co-founder” came to mean

The title became contentious as the company’s public profile grew. Eberhard objected to how Musk described his role in Tesla’s creation, and the dispute became part of a legal case. A 2009 settlement allowed five people—Eberhard, Tarpenning, Musk, and early Tesla figures JB Straubel and Ian Wright—to use the title co-founder.

That outcome reflects a distinction common in startup histories: founding can mean conceiving and establishing the company, providing the money that makes it viable, or helping shape its early direction. The settlement resolved who could claim the label; it did not erase the sequence of events. Tesla existed before Musk joined, while his early financing helped make its first major project possible.