Pichai's appointment grants Google, responsible for 90% of Alphabet's revenue, a second vote on the board. The only other Google executive with a seat on the board is Diane Greene, head of Google's cloud division.
Separately, after the market close on Monday, Alphabet reported adjusted second-quarter earnings of $5.01 per share on revenue of $26.01 billion versus analyst expectations of $4.46 per share on revenue of $25.6 billion.
TheStreet is hosting a live blog analyzing Alphabet's earnings report and conference call.
Pichai assumed the role of CEO at Google in 2015 when the company reorganized as Alphabet. He joined Alphabet, formerly known as Google Inc., in 2004 as vice president of product management, according to BoardEx, a relationship mapping service of TheStreet Inc. In April 2011, Pichai was named senior vice president of products.
"Sundar has been doing a great job as Google's CEO, driving strong growth, partnerships, and tremendous product innovation," Alphabet CEO Larry Page said in a statement. "I really enjoy working with him and I'm excited that he is joining the Alphabet board."
In addition to joining Page, Pichai will serve along side three other executive directors, including founder Sergey Brin, Chairman Eric Schmidt and Google Senior Vice President Diane Greene.
-- Anders Keitz contributed to this report.
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