Daniel Koh

Daniel Arrigg Koh (born January 1, 1985) is an American politician. Koh was Deputy Assistant to President Joe Biden and deputy director of the White House Office of Intergovernmental Affairs. He is the Democratic nominee in Massachusetts's 6th congressional district.

Early life and education Koh was born to doctors Howard K. Koh and Claudia A. Arrigg, the middle of three children. His father later served as United States Assistant Secretary for Health for President Barack Obama. Koh's mother is the granddaughter of Lebanese emigrants who arrived in Lawrence, Massachusetts in the 1890s. His uncle, Harold Hongju Koh, was Dean of Yale Law School and a Legal Adviser of the Department of State.

Koh and his two siblings graduated from Phillips Academy, where their mother attended and serves as an Alumni Trustee. He earned a Bachelor of Arts degree from Harvard University and a Master of Business Administration from Harvard Business School.

Career At the age of 29, Koh became chief of staff to Boston Mayor Marty Walsh after a stint as chief of staff for Arianna Huffington. Koh was featured in Forbes 30 Under 30 and the Boston Business Journal 40 Under 40.

Biden Administration In 2021, Koh was named Chief of Staff to the United States Secretary of Labor, Marty Walsh. Later, he served as Special Assistant to the President and Deputy Cabinet Secretary at the White House. He concluded his service as Deputy Assistant to the President and deputy director of the White House Office of Intergovernmental Affairs.

Political campaigns

2018 congressional campaign Koh ran in the 2018 election for Massachusetts's 3rd congressional district, in which he lost the Democratic primary to Lori Trahan by 145 votes, receiving 18,435 votes to Trahan's 18,580 votes.

Local government In 2019, Koh was elected to the Board of Selectmen in Andover, Massachusetts. As the top vote getter, Koh received 2,733 votes He resigned from the Board of Selectmen in February 2021 to join the Biden Administration.

In 2021, Koh was seen as a potential candidate for Lieutenant Governor of Massachusetts in the 2022 Massachusetts gubernatorial election. Koh did not run and Kim Driscoll was ultimately elected lieutenant governor.

2026 congressional campaign Koh announced in October 2025 he would be running in the 2026 election for Massachusetts's 6th congressional district. Koh won the September 1, 2026 primary with a plurality of 41.1%. The next candidate was Tram Nguyen at 29.5% and John Beccia at 12.0%. The race was the only open seat in the Democratic primary for the Massachusetts congressional delegation, succeeding Seth Moulton, who left for a U.S. senate run.

Personal life Koh is married to Amy Sennett, a lecturer in law at Columbia Law School and General Counsel at micro1. They met at Harvard, where Koh was pursuing an MBA and Sennett a JD/MBA. The couple eloped in 2016 at Boston City Hall, where Koh's boss, Mayor Marty Walsh officiated. A religious ceremony was held the following month.

Koh has ADHD.

Electoral history