From chaotic lines outside the courthouse to the presiding judge who runs a precise schedule, here is how the Tesla CEO's testimony went.

The billionaire is on the hook for $1.5 million for failing to disclose his 5% stake in Twitter in a timely fashion.

Elon Musk, the world's richest person, took the stand and testified over the course of three days in his trial against OpenAI CEO Sam Altman.

On his third day of testimony, Elon Musk will be cross-examined by lawyers from OpenAI and Microsoft. His answers on the stand grew testy on Wednesday.

In his second day on the stand in the trial he launched against OpenAI, Elon Musk said the AI start-up he'd helped found had strayed from its charitable mission.

Elon Musk became visibly irritated on the witness stand Wednesday as an attorney for OpenAI questioned whether the billionaire backed off his financial commitment to the startup in its early years.

Elon Musk, the Tesla CEO, world's richest man and OpenAI cofounder, took the stand Tuesday in a high-stakes trial revolving around a bitter feud with his former friend Sam Altman that could reshape the future development of artificial intelligence

Elon Musk faced another day of cross-examination. Jared Birchall, Musk's wealth manager, was the next witness called in the blockbuster OpenAI trial.