Thomas Crooks started his martial arts training under Peter Williams in 1992 at the Epping Dojo in Sydney – and then with Pat Harrington soon after. He made his first visit to Sekiryūkan in Fukuoka with Sosuishi-ryu Australia (now Lotus Dojos Australia) in 2000. Returning to Fukuoka in 2006-2007 he stayed at Sekiryūkan for a period of time, training daily and commencing his study of true Sōsuishi-ryū Jujutsu and Koshi-no-mawari. He was very fortunate to receive direct instruction from the Headmaster and 16th Inheritor, Shitama Manzo Sensei, Dai Shihan, as well as his son, Shitama Shusaku Sensei. On returning to Australia in 2007 Thomas established and developed what was then Newtown Dojo, in Sydney, before relocating with his family to Perth, Western Australia. He was made a member of the Karo (leadership council) of Sosuishi-ryu Australia in 2004 and was appointed as a director in 2016. In October 2016 he and Peter Williams were appointed as representatives of the Sōsuishi-ryū Jujutsu Kai in Australia by Shitama Sensei Dai Shihan. Thomas left Lotus Dojos Australia in March 2017 and founded Kumataka Dōjōs with Peter Williams. They formally established the Sōsuishi-ryū Jujutsu Kai Australia (SJJK-AUS) in 2018, which they direct, and which is overseen by Shitama Sensei.
Thomas holds the teaching title of Kyōshi in Sōsuishi-ryū Jujutsu, conferred on him by Shitama Manzo Sensei in 2018. He is a member of the Sekiryūkan Sei Kaiin, holding full membership with the dōjō. He opened the Bayswater Dōjō in Perth, WA in 2016. Along with Peter Williams, he leads ongoing training visits to Sekiryūkan. Thomas holds the ‘Coach Judo’ certification with the Judo Australia Coaching Accreditation Framework (CAF).