Page and Brin's missive is a little livelier, talking about Google's "colorful tapestry of bets in technology across a range of industries", and noting that if the company were a person "it would be a young adult of 21 and it would be time to leave the roost". While he has run the core Google business for four years, he still reported to Page, Alphabet's chief executive, and Brin, its president.
Pichai, born in India, takes the helm at a time when Page and Brin, both 46, have been noticeably absent, and the company faces a torrent of controversies relating to its dominant position in the tech world.
Google chief Sundar Pichai was recently appointed as the CEO of the American giant's parent company, Alphabet.
The pair added they intend to remain "actively involved as Board members, shareholders and co-founders".
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"I want to be clear that this transition won't affect the Alphabet structure or the work we do day to day", he wrote.
Page and Brin now control more than 50% of the votes, and a spokeswoman for Alphabet said the founders have no plans to sell their stock, beyond previously disclosed plans.
They might well be proud, having taken Google/Alphabet from a search engine called Backrub, to a Californian garage, to the world's 17th largest public company (there may have been some other steps along the way).
Page returned as CEO after that and oversaw Google's expansion into far-flung areas, including high-speed fibre internet service and longevity research, as well as expensive flops such as its push into social networking. Pichai, who has an engineering background, took over as the head of Google's products before being promoted to CEO when Alphabet was created.
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Brin and Page announced their dual resignations and Pichai's new role in a letter published Tuesday to Google's blog.
Sundar Pichai will be responsible for Google, as well as Alphabet's Other Bets companies. Pichai stepped into the role of CEO of Google at the same time, following his meteoric rise to the top ranks of Google's leadership. He says he will continue to focus on Google while helping manage Alphabet's long term focus and future challenges.
Thousands of employees have protested, and some have even resigned, over ongoing uncertainty over why the "don't be evil" dogma famous to Google - and once embraced by Page and Brin - appears to be cracking.
Page is stepping down as CEO of Alphabet, while Brin is resigning as its president.
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The move was definitely appreciated by the shareholders as Alphabet's shares rose 0.75% following the announcement. "It's a strong foundation on which we will continue to build". Page's retreat into the background drew increasing criticism from employees and United States lawmakers, who demanded answers from him rather than Pichai about controversial projects such as an experimental search app for Chinese users.