Tesla CEO Elon Musk has responded to a tweet "reminding" people of Tesla Co-founders Marc Tarpenning and Martin Eberhard, and calling Musk "just a series-A investor who bought in". "I...led the design of...original Roadster. Eberhard was wealthy and could have risked his money, but was unwilling," Musk said. He added he received an honorary degree for his work on Roadster.