Isidore Campbell was born and raised in Patuanak. In 1957, he was put in Residential school at Beauval. After 8 years, he did his grades 9&10 at Lebret. He began his work career with the FSIN, in 1971, as a recreational coordinator, in the Battleford district. He helped create the Saskatchewan Native bantams hockey team, that eventually went to Europe to show their talent.

He then moved onto Alberta to wander around, from job to job until 1976. He met his wife Ornella soon after that, and then after 4 children were born, they made their home at LaPlonge reserve by Beauval. In 1987, he went to alcohol treatment centre, and hasn't had a drink since. His next job as MLTC Vice Chief was held for 8 years, contributing to MLTC's very successful entry into the business world.

After politics, Isidore stayed at MLTC, working as a self-government coordinator. Isidore eventually retired, but continued to help at Treaty 10 office. It was here that former Treaty Commissioner Cuthbertson asked him if he was interested to sit with a newly formed Treaty Elders Council. He gladly accepted and continues to sit on the board.