The co-founder of Google stepped down as CEO in August 2015 to lead Alphabet, a new publicly traded parent company that includes Google, the Google X lab, and businesses such as Calico, Nest and Fiber.
This year marks the first time any U.S. president fell out of the top two spots.
"I think it has to do a lot with the fact that this is going to be his last year in office -- he's a little bit more hamstrung both domestically and internationally," said Luisa Kroll, Forbes' assistant managing editor of wealth.
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2. Angela Merkel
The German chancellor has maintained her position as the most powerful woman on the planet for ten years. In December 2014, she became the longest-serving elected EU head of state after being elected to her third four-year term by Europe's biggest economic power.
Credit: Michael Probst/AP
1. Vladimir Putin
Russian president Vladimir Putin ranked number one for the third consecutive year. Putin has proven he will exercise his power to get what he wants - from Crimea, to Ukraine, to bombing ISIS forces in Syria.
"He's not afraid to go out and exercise his power," said Kroll. "He has no checks and balances."
In June his approval ratings reached an all-time high of 89 percent.
Read the full list of world's most powerful people on Forbes.com.