Mark Diehl Sullivan

Mark Diehl Sullivan

4.9
Rating: 7.0

Licensed for 27 years

Litigation Lawyer at Wilson, WY
Practice Areas: Litigation, Environmental and Natural Resources, Workers Compensation ... +4 more

5237 HHR Ranch Road, Wilson, WY

About Mark

Fees and Rates

Cost

Hourly Rates

$ 150-250 per hour

Contingency

25%-40%

Retainer

Sometimes


Payment Methods

  • Cash
  • Check

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Licenses

Licensed in Wyoming for 20 years

State: Wyoming

Acquired: 2005

Active

No misconduct found

Licensed in New York for 27 years

State: New York

Acquired: 1998

Delinquent

No misconduct found

Location

Mark D. Sullivan, P.C.

5237 HHR Ranch Road, Wilson, WY, 83014-9210

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Mark Diehl Sullivan's Reviews

Avvo Review Score

4.9 /5.0

30 Client Reviews

5 star (29)
4 star (0)
3 star (1)
2 star (0)
1 star (0)

Posted by Dustin | January 9, 2024 | Hired Attorney

This review is from a person who hired this attorney.

Brilliant

Exceptional lawyer in ever aspect. Mark is honest and upfront eith everyone. Treats everyone in the case with respect even tje opposition. Mark is driven and always willing to take a call. If you need somome who is very tactful and will earn your business Mark is the attorney you want.

Posted by Caroline | May 18, 2022 | Hired Attorney

This review is from a person who hired this attorney.

Exceptional

Last year, we found ourselves in a very unfortunate dispute over language in a lease we signed with a property manager and tenants. The conflict brought me to my knees...it was one of the hardest things I have ever experienced (and I have known real pain). And we could not find an attorney to help us.... When we called Mark Sullivan and explained the situation he agreed to help us. Over the next few months he provided exceptional counsel, and we ultimately prevailed. He was always available to us, and knew exactly when to push the other side, and when to give them time. Mark's professionalism, knowledge, wisdom and expertise helped us tremendously, and I am forever grateful.

Posted by anonymous | January 20, 2021 | Hired Attorney

This review is from a person who hired this attorney.

Property Damage Case

We hired Mark to help us manage a property damage case. We were a large group of defendants that were out of state and had never dealt with a situation like this; we hired Mark given his track record and expertise. Mark was nothing shy of phenomenal throughout the entire process. He did an incredible... job coaching us along the way and giving us sound advice to navigate the legal proceedings in Wyoming. Mark is very intelligent and professional and his fees were very reasonable. Ultimately, Mark helped us get this case settled which was optimal outcome for all parties. I would absolutely recommend Mark to potential clients because of his ability to ease a very stressful process.

Posted by Kenneth | January 20, 2021 | Hired Attorney

This review is from a person who hired this attorney.

Construction Litigation

After a dispute with our builder we hired Mark to handle our case. We were very satisfied with the outcome and Glad that we chose Mark to handle this for us. He was very knowledgeable in the facts and the law and handled this very professionally and presented a well thought out and strong case. Hi...s fees were very reasonable and it was a lot less stress knowing you had a qualified person leading in what can be a stressful event.

Posted by anonymous | January 8, 2020 | Hired Attorney

This review is from a person who hired this attorney.

HOA legal representative

I am the president of our homeowners Board of Directors. Mark represented us in litigation against one of our homeowners who was in violation of our covenants. He developed evidence and litigated the case in court successfully, allowing us to remedy the issue and recovered all our costs. He has alway...s been personable, diligent, and willing and able to provide solid legal advice to our board of directors and our homeowners.

See All Client Reviews

Mark Diehl Sullivan's Lawyer Endorsements

Endorse Mark
Stephen C Biggs headshot
Stephen Biggs

Litigation lawyer | Apr 29

Relationship: Worked together on matter

"Mark is an excellent lawyer and a very amiable person. Our firm worked with him as co-counsel on two cases in Wyoming. Mark has a solid knowledge of the law, is a skilled litigator, is deeply concerned for the well-being of his clients, and is a consummate professional. I would recommend him to others looking for a lawyer to represent them in Wyoming."

Jessica Rutzick headshot
Jessica Rutzick

Litigation lawyer | Feb 15

Relationship: Fellow lawyer in community

"Mark gets terrific results for his clients and is a really good person to boot."

Jeffrey Michael Norton headshot
Jeffrey Norton

General practice lawyer | Nov 04

Relationship: Friend

"I have known Mark for over 16 years and I can say unequivocally that he is one of the most naturally gifted lawyers I have ever known. His ability to craft legal arguments and understand complex legal issues is remarkable and make him a formidable adversary in and out of court. He is also a consummate professional and widely respected. Although these qualities alone would make him a good lawyer, Mark also is a committed and passionate advocate for his clients and a genuinely decent guy to boot. Accordingly, I recommend and endorse Mark without reservation."

View All Endorsements
Stephen C Biggs headshot
Stephen Biggs

Litigation lawyer

Richard R. Thomas headshot
Richard Thomas

Litigation lawyer

Jeffrey Michael Norton headshot
Jeffrey Norton

Litigation lawyer

Stephen Lawrence Kass headshot
Stephen Kass

Environmental and natural resources lawyer

Jessica Rutzick headshot
Jessica Rutzick

Litigation lawyer

David F. Defazio headshot
David Defazio

Litigation lawyer

Experience

Rating:  7.0 (Very Good)

Work Experience

2006 - Present

Partner, Mark D. Sullivan P.C.

1999 - 2006

Associate, Carter Ledyard & Milburn, LLP

1997 - 1999

Senior Watershed Attorney, Riverkeeper, Inc.

Associations

2010 - Present

Wyoming Trial Lawyers Association

2006 - Present

Teton County Bar Association

Sample of Legal Cases

Shaw Construction v. Rocky Mountain Hardware, 275 P.3d 1238 (2012)

Victory

Meyer v. Hatto, 198 P.3d 552 (2008)

Victory

RISD v. RIOC, 291 A.D. 2d 40; 735 N.Y.S.2d 83 (A.D. 1st Dept 2001)

Victory

See More Legal Cases

Education

1999

Pace University School of Law

LL.M - Master of Laws

1997

Pace University School of Law

J.D.

1993

Kenyon College

BA - Bachelor of Arts

Publications

2006

New York State Bar Association Journal (cover story) The EPA's New Clean Air Rules

Activity

Avvo Rating

Our Rating is calculated using information the lawyer has included on their profile in addition to the information we collect from state bar associations and other organizations that license legal professionals. Attorneys who claim their profiles and provide Avvo with more information tend to have a higher rating than those who do not.

What determines Avvo Rating?
  • Experience & background Years licensed, work experience, education
  • Legal community recognition Peer endorsements, associations, awards
  • Legal thought leadership Publications, speaking engagements
  • Discipline Disciplinary information may not be comprehensive, or updated. We recommend that you always check a lawyer's disciplinary status with their respective state bar association before hiring them.
Avvo Rating Levels
10.0 - 9.0 Superb8.9 - 8.0 Excellent7.9 - 7.0 Very Good6.9 - 6.0 Good5.9 - 5.0 Average4.9 - 4.0 Concern3.9 - 3.0 Caution2.9 - 2.0 Strong Caution1.9 - 1.0 Extreme Caution