OpenAI executive Brad Lightcap has announced his departure from the company. Lightcap spent eight years at the organization and served as chief operating officer for four years before transitioning to a special projects role in April. His exit follows a recent pattern of leadership changes at the artificial intelligence lab.

Lightcap was one of CEO Sam Altman's closest associates. The two worked together at the startup incubator Y Combinator prior to the founding of OpenAI. In a statement posted to social media, Lightcap noted his intent to pursue new opportunities after his tenure.

The leadership shift comes at a critical time for the company. OpenAI is currently managing internal adjustments as it prepares for a public offering and works to justify a valuation of $852 billion. Denise Dresser, the company’s chief revenue officer, took over the majority of Lightcap’s operational responsibilities earlier this year.

Several other key executives have exited the firm in recent months. This list includes product and business head Fidji Simo, who left to focus on personal health. Other notable departures from April include Bill Peebles, Kevin Weil, and Srinivas Narayanan. The company continues to navigate these personnel changes while maintaining its focus on long-term development.