Apple announced on Monday that CEO Tim Cook will be replaced by John Ternus . Executives across the tech industry began reacting to the transition shortly after the news broke. Cook has served as the iPhone maker's CEO for nearly 15 years, after late founder Steve Jobs resigned in 2011. "Tim Cook is a legend," OpenAI CEO Sam Altman posted on X . "I am very thankful for everything he has done and I am very thankful for Apple." Apple and OpenAI first partnered in 2024 , integrating ChatGPT into