Subsequently, Hasson worked at the Washington law firm Williams & Connolly, where he became well-known and controversial for defending Catholic University's decision to fire Charles Curran for his opposition to Church doctrine despite his being a respected moral theologian.

Kristina Arriaga, who was the executive director of Becket starting in 2010 and a member of the firm since 1995,[8] is now a senior advisor to the board.

Becket also asserts that "[r]eligious people and institutions are entitled to participate in public life on an equal basis with everyone else.

In Hosanna-Tabor, the Supreme Court unanimously ruled (9–0) in favor of the ministerial exception doctrine for the first time, which exempts religious institutions from anti-discrimination laws in hiring its "ministers".

[14] They also served as counsel to the plaintiffs in Burwell v. Hobby Lobby Stores, Inc. (2014)[15] in their fight to exempt themselves from having to pay for four different drugs and devices they deemed as abortifacients.

[16] The court ruled 5–4 in favor of Hobby Lobby, asserting that family owned businesses have a right to operate in accordance with their conscience.

[19] The Court agreed to take on the case and Becket represented Holt, citing that the denial of the plaintiff's right to grow his beard according to his faith is a clear violation of the Religious Land Use and Institutionalized Persons Act.

[24] Becket has also filed petitions to the Supreme Court in two cases involving the United States Department of Health and Human Services' contraceptive mandate on employer-paid health insurance coverage of contraception, which had at the time been consolidated into Zubik v. Burwell, Little Sisters of the Poor v. Burwell,[25] and Houston Baptist University and East Baptist University v.

[30] In 2010, Becket represented Sacramento-area public school students who sought to continue reciting the current form of the Pledge of Allegiance (including the words "under God") in Newdow v. Carey, the second case brought by Michael Newdow seeking to remove the words "under God" from the Pledge of Allegiance.

Becket brought the first case under the Religious Land Use and Institutionalized Persons Act, and has been involved with such litigation throughout the United States.

[42] Becket has represented Muslim clients in the European Court of Human Rights, and assisted in pre-litigation and litigation in Europe, Asia, and Australia.