Thunder Bay police have charged a 46-year-old man with sex-related offences dating back to 1983.
Police arrested Jeff Paxton on charges of gross indecency, sexual assault, and invitation to sexual touching.
The alleged victims were boys between 7 and 14 years of age at the time of the alleged incidents, which span a period of about two decades.
"We are concerned that there may be other victims out there," said Thunder Bay Deputy Police Chief Andy Hay. "A lot of crimes of this nature, people are very reluctant to come forward, but once they know that there is a bona fide investigation underway...sometimes they will be encouraged to come forward."
Police said Paxton has served as a counsellor at Round Lake Bible Camp, has been involved with Thunder Bay churches, has owned The Great Northwest Coffee Company, and has served as a babysitter.
The investigation is ongoing as more complainants and witnesses contact police.
Paxton made a court appearance on Tuesday and was remanded to the Thunder Bay District Jail until June 21.