He has worked in the civil legal aid field since 1983, at more legal services offices than any attorney in Minnesota. Mr. Persellin's current practice centers on Social Security, debt collection, and Medical Assistance appeal issues. He is co-chair of the MSBA Social Security Disability Section, and edit's the Section's newsletter. Since 2008, Mr. Persellin has maintained case law summaries and an index of Social Security cases within the 8th Circuit. His deputy director describes Mr. Persellin as having "a legendary career as an all-around utility player for Mid-Minnesota Legal Aid."