USA on his first international excursion with Mikey Nicholls where they were a tag team known as The Kerrigan's in All Pro Wrestling. In Los Angeles, Jackson continued to further his professional wrestling training under WWE Hall of Famer Antonio Inoki at the NJPW LA Dojo. Jackson wrestled on the NJPW Dojo events, co-produced with NWA Pro, that took place at the LA Dojo in Santa Monica, including a match for the NWA British Commonwealth Heavyweight Championship against Fergal Devitt. After his time at the LA Dojo, Jackson was recruited into the ranks of Japan's wrestling scene, where he worked one show with New Japan Pro-Wrestling (NJPW). In October 2008 Jackson returned to Japan to take part in the "PROWRES EXPO 2008" in Tokyo's Ryogoku Kokugikan. In 2010 Jackson participated in his first tour for Zero1, where he would remain a fixture for the company. He formed a tag team with Steve Corino where they battled Akebono Tarō and Shinjiro Otani for the Intercontinental Tag Team Championships. Between 2010 and 2016 Jackson split his time competing in his home country of Australia, along with locales like Nepal, New Zealand and Myanmar. Myanmar held their first ever pro wrestling event at the Thein Phyu Stadium. The Myanmar Martial Arts Wrestling featured Hartley Jackson up against Masato Tanaka in a singles match. Between 2016 and 2018 Jackson moved to Japan full-time to work for Zero1. During this time, he became a member of the Voodoo Murders, where he went on to capture the United National Heavyweight Championship (Zero1) and the Intercontinental Tag Team Championship (Zero1) which he held with Voodoo Murders leader, Yoshikazu Taru. Also in this time, Jackson participated in a series of Exploding Bat matches, fighting against Frontier Martial-Arts Wrestling's Atsushi Onita. Jackson returned to Zero1 in 2020 on a permanent basis. He has fought for the World Heavyweight Championship and was named as one of the participants in this years 2020 Zero1 Fire Festival. In his career in Japan, Jackson has wrestled for Zero1, Hustle, BJW, IGF, SWF and Real Japan Pro Wrestling (RJPW) with one match for NJPW, along with earning championships to his name. He is a former two-time United National Heavyweight Champion and a former one-time Intercontinental Heavyweight Tag Team Champion. Jackson competed in the 2013 Zero1 Tenkaichi Jr. Tournament, dropping to 99.9 kg to make the competing weight, competed in the 2017 Zero1 Furinkazan Tag