Thomas was involved in starting up self-help groups in Sweden. He was a member of the research team carrying out the first Swedish prevalence study.
He started and was head of the national helpline for problem gamblers for more then 10 years. He is founder of the Nordic organisation called SNSUS.
Since the early 1990 he has been involved in training counsellors and social workers about problem gambling. He has also developed an internet self-help manual for problem gamblers and since the mid-90s, he has been working with responsible gambling and is one of the originators behind PlayScan and Gamtest.