A White House staffer was killed Saturday when the bicycle he was riding collided with a vehicle during a charity ride, the Washington Post reported.

Jacob Thomas Brewer, 34, died about 3:40 p.m. when he lost control of his bike at a sharp curve. It crossed a double yellow line and hit an oncoming vehicle, cops told the Post. 

Brewer was a senior policy adviser in the Office of the Chief Technology Officer, part of the Office of Science and Technology policy.

"Simply put, Jake was one of the best," President Obama said in a statement. "Armed with a brilliant mind, a big heart, and an insatiable desire to give back, Jake devoted his life to empowering people and making government work better for them. He worked to give citizens a louder voice in our society. He engaged our striving immigrants. He pushed for more transparency in our democracy. And he sought to expand opportunity for all."

Brewer was riding Saturday as part of the Ride to Conquer Cancer fundraiser. His mother, Lori Brewer Collins, said Brewer was taking part in the ride because of a close friend who was a cancer patient.

"[He] lived life large and tended to live life for other people,” Collins said.

Brewer was married to Fox News contributor Mary Katharine Ham. They have a daughter, Georgia, and Ham is pregnant with a second child.

"I don't have to tell most of you how wonderful he was," Ham wrote on Instagram. "It was self-evident. His life was his testimony, and it was powerful and tender and fierce, with an ever-present twinkle in the eye. I will miss him forever, even more than I can know right now."