Born and raised in Philadelphia, Pennsylvania, Felder began training in martial arts at the age of 12 with Tae Kwon Do and Karate. Felder was talented, competing in the Junior Olympics for Tae Kwon Do. Felder attended Ridley High School and later the University of the Arts, for acting, graduating in 2008. During college, Felder began training in Muay Thai before later transitioning into mixed martial arts.
Felder compiled an amateur MMA record of 3-1 and began his professional mixed martial arts career in 2011. Felder competed entirely in his native Mid-Atlantic states, with most fights for the regional promotion Cage Fury Fighting Championships.
Felder ultimately became Lightweight Champion for the promotion, earning the title with a second-round knockout of Marc Stevens. Felder then defended his title once, with a second-round knockout of Craig Johnson, before signing with the UFC in August 2014.
Felder made his promotional debut on October 4, 2014 at UFC Fight Night 54 where he face Jason Saggo. Felder won the fight by split decision.
Felder was briefly scheduled to face Johnny Case on January 18, 2015 at UFC Fight Night 59. However, Felder was tabbed as a replacement against Danny Castillo on January 3, 2015 at UFC 182, replacing Rustam Khabilov. Felder defeated Castillo via second-round knockout, which earned Felder a Performance of the Night award.
Felder was expected to face Jim Miller on April 18, 2015 at UFC on Fox 15. However, Felder pulled out of the fight citing a knee injury and was replaced by Beneil Dariush.
Felder faced Edson Barboza on July 25, 2015 at UFC on Fox 16, replacing an injured Myles Jury. He lost the fight by unanimous decision. Both participants earned Fight of the Night honors. UFC President Dana White said afterwards that the fight "takes Felder to another level".
Felder faced Ross Pearson on September 5, 2015 at UFC 191. He lost the back-and-forth fight by split decision.
Felder faced Daron Cruickshank on January 17, 2016 at UFC Fight Night 81. He won the fight via submission in the third round.
Felder next faced Josh Burkman on May 29, 2016 at UFC Fight Night 88. He won the fight via unanimous decision.
Felder faced Francisco Trinaldo on September 24, 2016 at UFC Fight Night 95. During the fight, repeated elbows from Trinaldo opened up a large, bloody cut on Felder's face. With a huge cut and blood streaming down Felder's face, the ringside physician waved the fight off at 2:25 of the third round. Felder lost by TKO (doctor's stoppage).
Felder faced Alessandro Ricci on February 19, 2017 at UFC Fight Night 105. He won the fight via TKO in the first round due to a combination of an elbow and punches. The win also earned Felder his second Performance of the Night bonus award.
Felder faced Stevie Ray on July 16, 2017 at UFC Fight Night 113. He won the fight by knockout in the first round after dropping Stevie Ray with a knee strike and subsequently finishing him off with a barrage of ground and pound. The win also earned Felder his third Performance of the Night bonus award.Cage Fury Fighting Championships
CFFC Lightweight Championship (One time)
One successful title defense vs. Craig Johnson
Ultimate Fighting Championship
Performance of the Night (Three times)
Fight of the Night (One time)
2015 January Knockout of the Month vs. Danny Castillo