Jeffrey Tan is a rope access technician who competed in American Ninja Warrior 5. In American Ninja Warrior 5, he breezed through the Baltimore qualifying course, even though he took 3 tries on the Warped Wall. He mostly cleared every with no issue and easily. However, he almost slipped on the Body Prop trying to celebrate with one hand. He still cleared the Finals as well. In Stage 1, he failed the Jumping Spider. Clearly angered by it, Jenn Brown asked him "How much would you say you wanna miss?". He replied "I wanted to win, no I wanted to win." Jenn ignored his comment and didn't even cared she messed up.
Jeffery was all-cut in American Ninja Warrior 6 St Louis qualifying. He shockingly failed near the end of the Rolling Mautra and ended his season quickly than he wanted it.
He competed one more time in Pittsburgh qualifying in American Ninja Warrior 7, he failed the 5th obstacle Devil Steps, placing 32nd on the leaderboard and coming so close to making it back to the finals.