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

31 Client Reviews

Showing 11 - 15 of 16 reviews | Recommendation

Posted by Scot & Gary | March 26, 2013 | Business

We are SOO grateful to Mark, and would highly recommend him to anyone.

We have hired Mark on 3 separate occasions; twice to review minor issues for us, and once for an extremely large problem that was potentially devastating. We last hired Mark to help us (and another great attorney, Richard R. Thomas, of Scottsdale, AZ) with a complex commercial litigation case involv...ing a $Trillion multinational corporation with unlimited legal/financial resources. We have known other lawyers with big egos and control issues. Not Mark. He is great to work with! Mark collaborated with our other attorney extremely well. Additionally, he welcomed our input as clients, and worked closely with us every step of the way. This was a particularly complex and challenging case that required attorneys to do detective work and extensive research. Whatever Mark didn't already know, he learned or figured out; he didn't just stick with strategies he was familiar with or had previously employed. Mark was impressively thorough! Further, his preparation for hearings, depositions, etc. was not only noteworthy, but admirable. Mark's high levels of professionalism, ethics, and true integrity served us well; and, we believe, added even more credibility to our case in the eyes of the judges. It is our opinion that any judge, jury, arbitrator, or mediator will not only like Mark, but, most importantly, really respect him. Mark's billing practices have been very fair, and he has deserved every penny. Mark has heard our "thank you's", witnessed our tears of joy, and has felt our genuine hugs... and there is still gratitude we have yet to express for what he has done for us. While we are hoping to never again be involved in any type of lawsuit, we would, without hesitation, put our trust in Mark D. Sullivan again.

Posted by Pauline | February 25, 2013 | Contracts & Agreements

Recommended wholeheartedly & without reservation

The case Mark handled for me and my husband was a breach of contract, fraud and racketeering case involving multiple plaintiffs against a modular homebuilder that had closed up shop, leaving us all with partially-completed but fully-paid-for homes. Mark's representation of us included a hearing in C...heyenne in which we were seeking a preliminary injunction freezing the defendants' assets which were in danger of being liquidated. Ultimately, thanks to Mark's expert advice, we elected to have him guide our case through mediation, and we successfully avoided going to court. Without Mark's tireless efforts, his impeccable professionalism, and--perhaps most importantly--his vision in bringing racketeering charges to bear in the case, our outcome would likely have been very different. We remain profoundly grateful for Mark's comprehensive evaluation of our complaint, his faith in the strength of our case, and the herculean effort he exerted on our behalf. We recommend him wholeheartedly and without reservation.

Posted by David | February 14, 2013

This is the attorney you want.

I have worked with Mark on a number of occasions and have always been impressed with his informed and confident approach towards legal matters. When a conflict arises in my office which prohibits me from taking a case, he is my first referral choice. Clients have routinely reported that they were i...mpressed with his representation, which includes honesty, preparation, and solid results.

Posted by Annette | February 14, 2013 | Lawsuits & Disputes

MARK D. SULLIVAN IS AN EXCELLENT CHOICE

Mark D. Sullivan has represented our company for the past six years, enabling resolutions on various legal disputes with some of our customers in the hardware/construction arena. Prior to retaining him for legal counsel, we did our "do diligence" and discovered how extensive his background is in com...mercial litigation, including complex environmental matters. We immediately knew that Mark was the attorney to represent us concerning legal issues within the construction industry. In one extremely difficult case in particular, our company prevailed in District, as well as Supreme Court, with an affirmation in full of the District Court's judgment. We were awarded damages in full, including interest and attorney's fees and costs. This case was unusually challenging and required extensive research, writing time, and attention to detail. It is very impressive to watch Mark in action before the Courts. He always comes prepared using his skills and experience to persuasively present and argue the matters at hand. We have recommended Mark on several occasions to others requiring legal counsel. He is definitely the attorney you want representing you and standing by your side.

Posted by anonymous | February 14, 2013 | Lawsuits & Disputes

Grateful

Mark is a professional in every sense of the word. He represented me in a case I nearly didn't pursue because I thought it was beyond victory. Through his hard work and endless dedication we did win, and I have remained very grateful to him to this day. I have referred him to my friends and associ...ates with the utmost confidence he would serve them as well as he served me.

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

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