Koslov was trained by Jesse Hernandez and made his professional wrestling debut in Covina, California on May 23, 2003, against Kid Karnage working as "Alex Pincheck".

On June 11, 2006, Koslov won the NWA British Commonwealth Heavyweight Championship in Santa Monica, California from Karl Anderson, less than a month later he lost the title to Justin White.

The group saw limited success and by the start of 2008 rarely teamed together, when Rey Bucanero returned to Los Guerreros de Atlantida the stable dropped altogether.

Koslov made a couple of "pre-tournament" appearances defeating Curry Man one week and losing to Team USA captain Kaz.

On August 21, 2009, Koslov regained the Cruiserweight championship by winning a five-way elimination match at the 2009 Verano de Escándalo defeating Extreme Tiger, Jack Evans, Teddy Hart and Rocky Romero.

[48] On March 2, 2013, Koslov and Romero, now working together as a tag team, returned to ROH at the 11th Anniversary Show, where they were defeated by The American Wolves (Davey Richards and Eddie Edwards).

[52] On September 20 at Death Before Dishonor XI, Koslov and Romero successfully defended the IWGP Junior Heavyweight Tag Team Championship against The American Wolves.

[55][56] Sherman, using his real name, made his FCW debut on November 20, 2010, at a house show in Punta Gorda, Florida in a losing effort against Bo Rotundo.

[7][57] Sherman made his televised debut on the November 28 edition of FCW TV, wrestling under the ring name Peter Orlov in a match, where he and AJ were defeated by Lucky Cannon and Naomi.

[59][60] Sherman made his first post-WWE appearance on March 4, 2012, when he, once again performing as Alex Koslov, defeated SoCal Crazy at an Empire Wrestling Federation event in Covina, California.

[67][68] Koslov returned to New Japan on July 7, now representing the promotion's top villainous stable, Chaos,[69][70] as a member of which he also reunited with former AAA partner Rocky Romero, with the two dubbing their tag team "Forever Hooligans".

[71] On July 22, Koslov and Romero defeated Jyushin Thunder Liger and Tiger Mask to win the IWGP Junior Heavyweight Tag Team Championship.

[72] Koslov and Romero made their first successful title defense on August 26 at a Sacramento Wrestling Federation (SWF) event in Gridley, California, defeating the team of A.J.

[73][74] Forever Hooligans made their second successful title defense on October 8 at King of Pro-Wrestling, defeating the Time Splitters (Alex Shelley and Kushida).

[75][76] On October 21, Forever Hooligans entered the 2012 Super Jr. Tag Tournament, defeating Jyushin Thunder Liger and Tiger Mask in their first round match.

[79][80] Koslov returned to New Japan in early 2013, and on February 10 at The New Beginning, he and Romero unsuccessfully challenged the Time Splitters for the IWGP Junior Heavyweight Tag Team Championship.

[81] On May 3 at Wrestling Dontaku 2013, Koslov and Romero regained the IWGP Junior Heavyweight Tag Team Championship from the Time Splitters.

[84] Koslov and Romero made their first successful defense of the IWGP Junior Heavyweight Tag Team Championship on June 22 at Dominion 6.22 in a rematch with the Time Splitters.

[85][86] Koslov and Romero then got involved in Chaos' rivalry with the Suzuki-gun stable, which led to their second successful title defense on July 20 against Taichi and Taka Michinoku.

[92] Later in the month, Koslov was scheduled to take part in the 2014 Best of the Super Juniors, but after dislocating his left shoulder in his first match, he was forced to pull out of the tournament.

[93] On January 4, 2015, at Wrestle Kingdom 9 in Tokyo Dome, Forever Hooligans challenged for the IWGP Junior Heavyweight Tag Team Championship, but were defeated by the defending champions, reDRagon, in a four-way match, also involving Time Splitters and The Young Bucks.

Sherman is close friends with some professional wrestlers such as Shinsuke Nakamura, Kazuchika Okada, Konnan, Rocky Romero, The Young Bucks, and many others.