MO
Mark D. O'Leary
Mark D. O'Leary is a lawyer in Sioux Falls, SD who works for O'Leary Law Office. Practice areas include Aviation, Construction, Insurance. Court admissions include Eighth Circuit Court of Appeals, Federal. Licensed in Texas since 1988. Graduated from William Mitchell College of Law in 1986.
Claim profileContact attorney
Law school
Bar admission
Office
Disciplinary
MO
Mark D. O'Leary
O'Leary Law OfficeSioux Falls, SD·38 years licensed
Claim profileContact attorney
Mark D. O'Leary is a lawyer in Sioux Falls, SD who works for O'Leary Law Office. Practice areas include Aviation, Construction, Insurance. Court admissions include Eighth Circuit Court of Appeals, Federal. Licensed in Texas since 1988. Graduated from William Mitchell College of Law in 1986.
Law school
William Mitchell College of Law
Class of 1986
Bar admission
1988
State Bar of TX · #15252400
Office
3500 S Phillips Ave Ste 118
Sioux Falls, SD 57105
Disciplinary
None on record
Clean since admission
Case data
Click “Load case data” above to view charts.
Practice, courts & credentials
Practice areas6 listed
AviationConstructionInsuranceLitigation: CommercialLitigation: Personal InjuryWorkers' Compensation
Courts admitted9 total
Eighth Circuit Court of Appeals
Federal
Federal Court
Minnesota District Court
South Dakota District Court
South Dakota State Courts
Supreme Court
Texas Eastern District Court
Texas Southern District/Bankruptcy Court
Reviews
No reviews yet. Be the first →
Last refreshed Aug 2026