Mark D. O'Leary

Litigation Attorney at Sioux Falls, SD

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President

Proficient attorney

About Mark

Learn Mark’s areas of practice.

Practice areas

Car accident

25%

37 years
Lawsuits and disputes

25%
Litigation

25%

General Practice of law with emphasis on civil litigation, insurance claims, commercial litigation, and problem solving through the application of sound practices of alternative dispute resolution. Licensed in South Dakota, Minnesota, Texas, and the Federal Courts.
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37 years
Personal injury

25%

37 years

Mr. O’Leary has extensive experience in a wide variety of products liability, subrogation, employment, personal injury, general commercial litigation, contracts and agreements, business disputes, insurance bad faith, and workers’ compensation claims.

Licensed for 36 years

State SD

Status Active

Acquired 1994

Updated 11/12/2013

State TX

Status Eligible to Practice in Texas

Acquired 1988

Updated 01/25/2023

State MN

Status Authorized to Practice

Acquired 1986

Updated 01/24/2023

We have not found any instances of professional misconduct for this lawyer.

Contact Mark

O'Leary Law Office

3500 S Phillips Ave Ste 120

Sioux Falls, SD, 57105-6864

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Reviews

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5.0 / 5.0

7 customer reviews

5 Star

100%

4 Star

3 Star

2 Star

1 Star

Posted by Yvonne | May 2, 2021

President

Mark O’Leary is exceptional! Great advisor and consummate professional. Highly knowledgeable and experienced in litigation matters. Dependable and fair. Mr O’Leary is personable and easily relatable individual. Felt very comfortable working with him. Highly recommend for any business or individual legal matters.

Posted by Lidia | October 8, 2020

Proficient attorney

Mark O'Leary managed to successfully navigate around the obstacles and brought the case to the positive resolution.

Posted by Aaron | October 7, 2020

Litigation work

Mark is an amazing attorney that helped me out of the worst time in my life. I would highly recommend him. He is an extremely bright and level-headed litigator who wants to do what is in your best interest.

Posted by anonymous | January 18, 2014

Business Opportunity

My husband and I hired Mark O'Leary to help us make an informed decision regarding a new business investment. Mark was able to patiently explain the pros and cons of each aspect of the new venture. Mark also helped to make sure that we were legally protected from any fall out with the first owners, and created a very specific contract for us. Our situation required quite a bit of research on his part, since it involved a foreign owned business in North Africa, not exactly a typical client request for him. With Mark's advice and his thoroughness of reviewing all factors in this situation we felt confident to move forward. I would highly recommend Mark for any legal advice that you might need.

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Posted by Bill | January 16, 2014

Great Attorney

Mark O'Leary has represented me for several years. First class gentleman and very smart Attorney. Mark's input will help you make solid legal decisions. He will always be thinking in your best interest. I would recomend Mark to anyone. You won't be disappointed.

Posted by Chris | November 27, 2013

Top Litigator

Mr. O'Leary is truly an excellent attorney on all counts. He is a gentleman and well respected by his peers. He is known for his straight forward approach in communications and his superior knowledge of the law. Mark does not hip shoot his opinions and prepares well for trials. He is very fair and honest in billings practices and places his client's interests above his own. In my profession, I have occasion to work with attorneys in multiple jurisdictions and have found Mark to be one of the finest and a pleasure to work with in all instances over the past 20 plus years. I have utilized his services for my businesses, my personal matters as well as recommended him frequently to my clients and business associates.

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Posted by Robin | November 21, 2013

Client focused and 100% professional.

Mark O'Leary has represented me and my business since 1999 and has done so in an exemplary manner. He is very easy to talk to, quick to understand the issues and give excellent guidance even sometimes towards another attorney if he feels it serves the needs of the client better. Mark is very focused on what is best for his client which is why I go back to him whenever I have need of legal advice and services. I trust him completely and would not hesitate to recommend his legal services to friends and family.

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Cost

Resume

AVVO RATING 10.0 (Superb)

Work Experience

Owner
O'Leary Law Office
1991 - Present

Associate
Jardine Logan & O'brien, PLLP
1990 - 1992

Associate
Hirsch Glover Robinson & Sheiness
1988 - 1991

Education

William Mitchell College of Law
JD - Juris Doctor
1986

Associations

South Dakota Defense Lawyers Association
Board of Directors
2010 - Present

Defense Research Institute
Member
2005 - Present

South Dakota State Bar
Member
1993 - Present

State Bar of Texas
Member
1988 - Present

Minnesota State Bar Association
Member
1986 - Present

South Dakota Defense Lawyers Association
President
2014 - 2015

View all associations

Languages Spoken

English

Honors and Awards

Distinguished
Martindale-Hubbell
2016

Exceptional Performance Citation
Defense Research Institute
2015

Exceptional Performance Citation
Defense Research Institute
2014

Attorney endorsements

Received (3)

Given (2)

Endorse Mark

Michael Bornitz

Lawsuits and disputes Attorney | Jan 05
Relationship: Worked together on matter

"I endorse Mark. We have worked on the opposite side of cases, so I know he always brings his "A" game. Mark is a highly skilled attorney who is equally professional and ethical in all the work he does."