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Relentless DUI attorney in Aspen, Colorado

DUI Defense Lawyers Association Board Certified
National College for DUI Defense Board Certified
ACS-CHAL Lawyer Scientist
Colorado Bar Association
Boulder Bar Association

Notable Colorado DWI Victories

not guilty

DWI 4th / People v. B.D.

Jackson County 8th District Court


NOT GUILTY!!! of Felony DUI-DWAI 4th offense/ Resisting Arrest/ and No Insurance. Big thank you to the courageous jurors. We were in Walden, CO (pop. 1500) going against the Sheriff of the town and the #2 Undersheriff. Our client was a blue collared worker with a past of 3 DUIs (95,02,06) and a felony in 03.  He took the stand and told the truth in the face of the most powerful officers in the town. The State offered him misdemeanor deals, he refused. I had an easy defense of intox after the time of driving but the client said that was not true because he was never intoxicated. 599 days he has been stating his innocence and risked guaranteed prison time if we lost.

Client was going to show his son a cabin they dreamed of having. They made a u-turn on a highway to go back and the intox son told his dad to back up too far. Truck got stuck on the soft shoulder.  So he backed it down the slope and off the hwy. Got a ride back to camp with his son. Intox son grabbed some guys and went back to pull it out. Some passerby calls 911 and says drunk people slid off the road. #1 and #2 sheriff show up and run the plates. Get son to take them back to Dad at camp. Dad is pissed and drinking a beer. He didn’t stand a chance. Arrested and the cops say he fought back. Police also plagiarized their reports and alleged he was so drunk he urinated himself in his truck. They found him “passed out” in bed in urine covered clothes and he could barely stand.

The DAs only put on #2 sheriff and son. They didn’t bring the 911 caller or the 2 other police witnesses.  Our client testified and also expert David Keech on how bad the police investigation was. I knew that the jurors would have a hard time finding him NG and living in the town with those authorities. So we agreed that officers had probable cause but the DAs didn’t prove their case with the limited witnesses and evidence and that’s not how you prosecute a felony.

It took a lot of courage for the jurors of this small town to basically disbelieve the highest officials of their town on what I would say is an extreme DUI (3 priors, wreck, urinated himself, passed out, fighting back).  Cops alleged all of that happened. Client testified none of that happened. He owned up to all of his priors but the rest was pure lies by the #1 and #2 sheriffs in town.

Big thank you to my local counsel, Denton Walker. Denton crushed the investigator. Battled the CO law and moved for dismissals at every turn for hiding and destroying evidence. We stayed in an AirBnB one house over from the #2 sheriff as we were basically calling him out for poor investigation and fabrication. Didn’t get a lot of sleep this week. Tons of stories. Courage and truth prevail!

Thanks to God for seating the right people, in the right place, at the right time. Thank you to my staff for having me ultra prepared. Thanks to my wife for hold down the fort and booking us an AirBnB next to the main witness (who probably wanted to kill me after my cross of him). Not even a deadbolt on the front door!  Judge was very complimentary afterwards. Thank you to that jury for remaining true to your doubts and following the law. #wefightgiants #TLFstrong

(A juror stopped us on our way out to thank us for calling out the police. Apparently this is a big issue in this town. She wanted our cards to keep fighting and calling them out. I feel like we may be back and make a great 80s movie out of it!)

not guilty

False Imprisonment and Criminal Mischief / People v KM

Pitkin County


The client was found Not Guilty by a jury of his peers for False Imprisonment and Criminal Mischief. The client used to work as the manager of Roxy’s Corner. He had an ex-girlfriend who would constantly drive by and harass him — so much so that he had to get a restraining order against her. Additionally, the owners of Roxy’s and Steeps had banned her and her friends from the property. She had just gotten a new car and thought he wouldn’t know. She and her friend said they were going to Steeps and couldn’t find parking, so they parked behind the car wash on Roxy’s property. As our client was taking out the trash, he saw them hiding in the corner. He went to grab his phone to call the police and record them. As she tried to drive away she hit him with her car, breaking her mirror. She then tried to reverse and hit him and hit the tree by the car wash. The client stood in front of the car and called the police. The female officer arrived first and talked to the ex-girlfriend who said our client just came out of nowhere and beat on their car, even though her own video showed him calmly standing in front of the car calling the cops.  The cops gave the ex-girlfriend a ticket for trespassing and arrested our client for False Imprisonment and Criminal Mischief. The Judge wouldn’t let us get into the other three times the ex-girlfriend was cited for Violating the Protective Order, but the jury was very smart and read between the lines. “I’m calling the cops this time” is what he says on the video. The jury knew this wasn’t her first time harassing him. Big thank you to the jury for seeing through the evidence that wasn’t allowed to come in and realizing the truth. This was a just verdict that gave this man his life and freedom back.

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Mark Thiessen


DUI/DWAI Defense Attorney in Pitkin County

“I’m a Board Certified, trial-tested Super Lawyer focused on fighting for my client's freedom. If you hire me as your DUI attorney in Aspen, I’m available 24/7, because, at the end of the day, I work for you. Me being Board Certified in DUI Defense by the National College for DUI Defense means my clients can count on specialized, expert representation that most firms simply can’t deliver.”

What to expect?

Thiessen Law Firm is well-known for expert-level DUI defense attorneys and aggressive, trial-tested criminal defense techniques that enable us to fight like no other on your DUI case. Our trial attorneys not only fight for positive case outcomes, we also care deeply about the overall well-being of our clients.

Why Choose Thiessen Law Firm?

  • Proven DUI or DWAI Lawyer
  • Aggressive Criminal Defense Attorney
  • Board Certified in DUI Defense by the National College for DUI Defense
  • Super Lawyer (2013 – 2021)
  • ACS/CHAL Lawyer Scientist
  • Free DUI & Criminal Charge Case Evaluation
  • No Hourly Rates
  • 24/7 Accessibility
Mark Thiessen
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DUI attorney in Aspen and Pitkin County, CO that will fight for you

Mark Thiessen, the founding DUI defense attorney at Thiessen Law Firm, never backs down in the courtroom. With Mark, facts take precedence over promises –– he’ll tell the truth about your DUI case. Our team of attorneys hold honesty and virtue in highest regard and it is the foundation of ensuring your case ends with a satisfying, positive outcome.

When you get a DUI or DWAI or other criminal charge in Aspen or Pitkin County, your life is changed, no matter the verdict. When you hire Mark Thiessen from Thiessen Law Firm, he will fight to make sure that you can continue to live the life that you want. You’ll never feel forced into taking a deal that you don’t want, or accepting terms you don’t fully understand. With Mark’s expertise in DUI and forensic law, he can provide clients with the knowledge needed to fight for their rights effectively and fairly.


Charged with a DUI or DWAI in Aspen?

You only have 7 days to save your driver’s license

Whether you’re being charged with a DUI, DUI first offense, or DUID (DUI - drugs) in Colorado, you must act fast if you want to save your license. It is required that you request a DMV hearing within 7 days after your DUI arrest, or your license will be automatically suspended for 9 months. If you hire Aspen DUI attorney Mark Thiessen before then, he will request the hearing for you and fight to help protect your driver’s license.

Stop Your Suspension

Happy Clients

They turned what seemed like an impossible case into something with an unexpectedly amazing outcome

“Mark Thiessen is a very knowledgeable, honest, and trustworthy attorney. He and his associates work very hard, and are readily available anytime you need them. They fight for their clients yet maintain a polite and respectable manner in the courtroom. For me, they turned what seemed like an impossible case into something with an unexpectedly amazing outcome. I would highly recommend Mark Thies...

It was the best decision I could have made

“I’m a lawyer. I made a mistake one night and was arrested for suspicion of DWI. As a lawyer, it’s extremely difficult to trust your case to another lawyer. It’s ingrained in your bones to want to be in control, but you can’t because no matter what you’ve read on the internet or seen on TV, you don’t know that area of law, or the criminal judges, or the prosecutors, and the reality is all of th...

If You Want a GREAT Lawyer, Mark Thiessen is Your Man

“I found Mark Thiessen through several of my friends. I was having serious issues with the lawyer I had at the time. He kept telling me I was going to jail when I had done nothing. He did not believe me, and I believed he was gonna have me put in jail and not fight for my innocence. From the moment I met Mark Thiessen, I knew he was going to do everything for me to keep me from that horrid jail...

The Best Lawyer in the Industry

“I chose Mark Thiessen to represent me in a DUI / DWI case and it was the best decision that I could have made. Upon meeting with Mark – I immediately knew that he was the right attorney to represent me and give me the best opportunity to win my case. Mark is an expert attorney with a work ethic that is second to none. He is always available. He is a master of his craft and will give you the be...

This is the only lawyer you should choose for your peace of mind

“Everyone at the Thiessen Law Firm welcomed me and my family but most importantly they were clear in their answers to the many questions I had. Never doubted a positive outcome as I could see their expertise and the way they would be relaxed and calm on going about their business as if you were watching a perfectly synced movie! Ultimately Mr. Thiessen came through for my case and the most incr...

Fantastic Lawyer

“I would HIGHLY recommend hiring Mark Thiessen as your attorney for any criminal case. He is extremely knowledgeable of the court system and what actions can be taken pre-trial in order to have the best outcome at your court date. I was put on probation for a DWI a year previous to hiring Mark as my attorney. I failed to complete the requirements in order to get off of probation. My probation w...

I couldn’t have gone with a better Law Firm

“I have to start off by saying how thankful I am that my case was dismissed. I never thought I would need a criminal lawyer but life happens. Mark kept me informed during the entire process. He had a game plan from start to finish. I couldn’t have gone with a better law firm.”

Mark Thiessen is a Jedi Master of his craft.

“Mark and his team have a keen and tactical approach to handling your case, yet still manage to maintain a lot of empathy in their communication with you. A rare combination indeed. They definitely made this process of navigating the court system as smooth as it could possibly be. Things such as answering my texts late at night even on the weekends, and being there in person at the office fo...

If Mark can’t get you a win, nobody can

“Simply put, Mark Thiessen is a criminal defense all-star. If he can’t get you a win, nobody can. I’ve worked with Mark and his team on two very different cases, and both times I’ve been blown away by the level of honesty, strategy, and respect that Thiessen Law Firm brings to the table. You can feel the difference the second you step in the courtroom with Mark by your side. The time he has tak...

You Cannot Compare Anybody with Mr. Mark!

“I was accused by my own wife. It was a painful incident that happened in my life. She said to the police that I was threatening to kill her and beat her. She did this to be because she was looking for a lot of money from me and I couldn’t give her the money. She was so bad that she even made proofs with the doctors. There were witnesses from doctors and nurses and even some voice recordings. S...

Choosing a DUI attorney in Aspen

If you or a loved one are fighting a DUI or DWAI in Pitkin County, choose an attorney you can trust. It can be easy to pick the first lawyer you see on the internet, but it isn’t guaranteed they’ll be a good one. Don’t just look for any “lawyer near me,” look for a Colorado DUI attorney who wins.

Don’t gamble with your freedom and reputation. Even DWAI or a DUI first offense can be life-altering. At Thiessen Law Firm, we work tirelessly and fight aggressively to protect our clients’ rights against criminal charges.

In addition to being one of the youngest Super Lawyers in the field, Mark Thiessen is Board Certified in DUI Defense by the National College for DUI Defense, DUI Law by the DUI Defense Lawyers Association, and is an ACS/CHAL Lawyer Scientist — the highest form of scientific recognition available for lawyers.

What does all this mean? That Mark Thiessen does not back down in the courtroom because he has the unique expertise to fight DUI charges effectively. He will fight for you like you are his own family.

To get a DUI attorney on your side, request a free consultation with Mark Thiessen today.

Free DUI & Criminal Case Consultation

Call 970.233.9000 or fill out the form below for a free consultation.

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