Oliver Westfield Claffey, better known by the ring name Jack Gallagher, is an English professional wrestler and mixed martial artist. He is best known for his time in WWE, where he performed on the NXT and 205 Live brands, mostly under the ring name Gentleman Jack Gallagher. Claffey was released from WWE in June 2020. On January 25, 2022, BKFC announced Jack has signed a deal to fight for the organization, and will debut mid 2022. Claffey had worked in the British Independent circuit since 2006. In 2016, he competed on the WWE tournament Cruiserweight Classic. After the tournament, he was signed to a WWE contract and worked on the 205 Live brand, exclusively for cruiserweights.

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