https://arstechnica.com/gadgets/2019/12/larry-page-steps-down-as-ceo-of-alphabet-google-ceo-sundar-pichai-takes-over/

Google and Alphabet co-founders Larry Page and Sergey Brin are no longer executives at Alphabet or Google. The Alphabet CEO and president, respectively, have announced they are leaving their positions. Current Google CEO Sundar Pichai will take over as CEO of both Google and Google's parent company, Alphabet. Page and Brin explained the move on Google's company blog:

With Alphabet now well-established, and Google and the Other Bets operating effectively as independent companies, it's the natural time to simplify our management structure. We've never been ones to hold on to management roles when we think there's a better way to run the company. And Alphabet and Google no longer need two CEOs and a President. Going forward, Sundar will be the CEO of both Google and Alphabet. He will be the executive responsible and accountable for leading Google, and managing Alphabet’s investment in our portfolio of Other Bets. We are deeply committed to Google and Alphabet for the long term and will remain actively involved as Board members, shareholders, and co-founders. In addition, we plan to continue talking with Sundar regularly, especially on topics we're passionate about!