Brian Cullinan is a Managing Partner at PricewaterhouseCoopers. Cullinan has been in charge of counting ballots for the Academy Awards since 2014, with colleague Martha Ruiz. He lives in Los Angeles. Cullinan has been at the firm for over 30 years. His clients include Walt Disney Co.

Cullinan is a graduate of Cornell University, where he majored in Psychology, and of Northwestern University, where he switched over to accounting. At Cornell, he was a record-setting Javelin thrower.

In 2016, host Neil Patrick Harris pointed out Cullinan's resemblance to Matt Damon.

In 2017, Cullinan handed the wrong envelope to Warren Beaty and Faye Dunaway for the announcement of Best Picture. He handed them the Best Actress envelope, which listed Emma Stone of La La Land, which caused Dunaway to announce La La Land as the winner instead of the actual winner, Moonlight. Cullinan posted a photo of Emma Stone to his Twitter account just before the Best Picture debacle took place. He has since deleted the tweets.

Before the awards, Cullinan had addressed the possibility of a mistake in an interview, since Steve Harvey had recently announced the wrong winner at the Miss Universe pageant. He said: "We would make sure that the correct person was known very quickly. Whether that entails stopping the show, us walking onstage, us signaling to the stage manager — that’s really a game-time decision, if something like that were to happen. Again, it’s so unlikely."

Cullinan is married to Andrea Cullinan.