Justice Shaun M. O'Brien sits on the Ontario Superior Court of Justice and has rendered decisions in 21 cases from 2019 through early 2025. His docket has included a mix of motions (16), appeals (3), and trials (2). His case volume has been modest, averaging about 0.3 cases per month, with a noted decreasing trend in recent years and no reported decisions in the last year. Cases have been exclusively at the Superior Court level.