Kenney was born in 1991 to Brian Kenney and Roxanne Mosier in Portland. He started training judo at the age of five, eventually becoming nine-time national champion and holds 2nd dan black belt in the sport. Besides judo, Kenney started wrestling around the time he went to school. Like in judo, Kenney excelled in wrestling too, winning multiple state championships in both freestyle and Greco-Roman wrestling. Kenney attended Jay County High School in Indiana. After high school, he took his first amateur mixed martial arts bout on a whim without prior training. He went to study at University of Indianapolis, only to drop out after sophomore year to pursue his career in mixed martial arts. In an effort to do so, Kenney moved to Tucson to train at the MMA Lab and turned professional in late 2014.
Kenney fought most of his early professional fights primarily in the Tachi Palace Fights and Dragon House in California and Arizona. After amassing a record of 6-0 and captured the Tachi Palace Flyweight title against Alvin Cacdac, Kenney made two appearances in Dana White's Contender Series - Season - Season 1, Episode 2 web-series program on July 18, 2018, facing C.J. Hamilton where he won the fight via unambitious decision, but lost to Adam Antolin at Dana White's Contender Series - Season 1, Episode 8 on August 29, 2017. Kenny went on to fought under Legacy Fighting Alliance for the next four fights and he became the Flyweight and Bantamweight Legacy Fighting Alliance champion prior signed with UFC.
In his UFC debut, Kenney faced Ray Borg, replacing Kyler Phillips in six day notice, on March 30, 2019 at UFC on ESPN 2. At the weigh-ins, Borg weighed in at 137.75 lbs, 1.75 pound over the bantamweight non-title fight limit of 136 lbs. He was fined 20% of his fight purse and his bout against Kenney proceeded at catchweight. Kenny won the fight via unanimous decision. On December 29, 2018, Kenney faced Manny Bermudez on August 17, 2019 at UFC 241. However, the UFC decided to move the bout to a catchweight bout of 140 lbs. due to the fighters cutting substantial weight the night before weigh-ins. Kenny won the bout via unanimous decision. Kenney faced Merab Dvalishvili on February 15, 2020 at UFC Fight Night 167. He lost the fight by unanimous decision. Kenney faced Louis Smolka on May 30, 2020 at. He won the fight via a submission through a guillotine choke in round one. Kenney is expected to face Heili Alateng on September 19, 2020 at UFC 253.
