Kiichirō Hatoyama

Kiichirō Hatoyama (Japanese: 鳩山 紀一郎, Hatoyama Kiichirō) was born on 26 July 1976 in California, United States. His birth occurred during his father Yukio Hatoyama's doctoral studies in operations research at Stanford University. Yukio Hatoyama later served as Prime Minister of Japan.

He belongs to the Hatoyama family, a historically significant political family in Japan. His notable relatives include his great grandfather Ichirō Hatoyama, who served as Prime Minister of Japan and was the founder of the Liberal Democratic Party. Other family members include Kazuo Hatoyama, Ichirō's father, a prominent jurist and politician during the Meiji era, and Iichirō Hatoyama, Ichirō's son.

For his early education, Kiichirō Hatoyama attended Gakushuin Junior High School and Senior High School located at Komaba. In 1995, he enrolled at the University of Tokyo (UTokyo), continuing a family tradition of attending this institution. At UTokyo, he chose to specialize in urban engineering after the Shingaku Furiwake system and was also a cellist in the university orchestra.

He completed his master’s degree at the University of Tokyo in 2001. Subsequently, he earned a PhD in transport engineering in 2007; his doctoral thesis was titled "Guideline Formulation for Signalized Intersection Design Considering Impacts on Pedestrians' Psychology." After completing his doctorate, he remained at the University of Tokyo as an assistant professor and lecturer until 2017.

In 2017, Kiichirō Hatoyama was appointed as an associate professor at Nagaoka University of Technology. Between 2008 and 2011, he was a visiting professor at Moscow State University in Russia.

In the political arena, Hatoyama is affiliated with the Democratic Party for the People, which he joined in 2023. In the 2024 Japanese general election, he was elected to the House of Representatives representing the Tokyo proportional representation block. He was not successful in securing the Tokyo 2nd district seat, losing to the incumbent candidate. However, he obtained enough votes through the proportional representation list, with a sekihairitsu of 73.4%, to secure the last available seat allocated to his party in that block.