OpenAI's chief operating officer Brad Lightcap to take on expanded responsibilities, overseeing day-to-day operations and international expansion.Mark Chen appointed as chief research officer and Julia Villagra as chief people officer.No plans to replace Mira Murati as chief technology officer who left the company in September 2021.OpenAI completed a $6.6 billion funding round and is in the process of raising another $40 billion.