Our Team

We are logically minded and creative at heart. At Olivier Miles Holtz we are successful because we do things differently. We do not follow old models and we question all aspects of the law before applying it, challenging ourselves to see if we can change it for the better. We employ the highest standards of excellence in each case through close attention to detail, staying up-to-date on new court decisions, and thinking strategically in and out of the courtroom.

Kasey Olivier


With Kasey, there is no second place in litigation. Her secret to success is her ability to look at problems from 100 feet above and not from the ground up. When she does that, she sees the big picture and the goals of her clients and the opposing side. Kasey’s creative approach to litigation has landed her on the list of the Top 40 under 40 by the National Trial Lawyers,  a Rising Star by Super Lawyers, and voted a Top 10 female personal injury attorney in client satisfaction. Kasey served as the 2020-2021 South Dakota Trial Lawyers’ President and was recently honored by the City of Sioux Falls with the Arc of Dreams Community Dreamer award, which honors leaders in our community.

Kasey has demonstrated her success in the most sophisticated plaintiffs’ litigation cases against the toughest adversaries, ranging in cases from complex business litigation, personal injury, criminal defense, work place injuries, and estate and trust litigation. Kasey was elected President of the South Dakota Trial Lawyers for 2020-2021, where she spends her time dedicated to promoting and upholding South Dakota’s jury system to ensure that anyone who is injured by the misconduct or negligence of another can obtain justice, even when taking on powerful opponents.

When you meet with Kasey, she will always greet you with a warm smile and an unpretentious, down to earth and honest demeanor which always finds itself in settlement negotiations and the court room. Kasey will never lie to or mislead you and will always deal with you or anyone else with the most honest, transparent and passionate attitude you can think of.

Kasey is extremely clear with her advice, will bend over backwards to protect you and your family and will see you as nothing but a person who is respected and appreciated no matter the situation.

Kasey has been successful in her career because she takes the time to understand your priorities. Your situation is unique and requires an approach that suits you. Kasey always takes the time to listen to your priorities and goals and then advocates passionately on your behalf.

Kasey practices in the areas of personal injury, business, worker’s compensation, estate litigation, wrongful death and criminal defense.


 Kasey has lived her life as an advocate. She spent time in the foster care system before being legally emancipated and moving out on her own while still a senior in high school. Kasey worked hard, graduated with honors and was admitted to Augustana University. After spending time as an intern for Senator Tim Johnson in Washington, D.C., Kasey found her passion to help others. She received dual bachelor’s degrees from  Minnesota State University, Mankato, before being admitted to the University of South Dakota, School of Law. Since graduating from law school, Kasey has dedicated a large portion of her career to helping children in the abuse and neglect system and giving back to the community. Kasey was featured in Sioux Falls Woman Magazine which gives an in-depth look into her life. Read the article here.

Ashley Miles Holtz


Ashley has been chosen as one of the Top 40 under 40 by the National Trial Lawyers Association, a Super Lawyers Rising Star, Top 40 under 40 by the Association of American Trial Lawyers, and voted into the Top 10 female personal injury attorneys in client satisfaction. Ashley’s success stems from her ability to analyze the facts of each case and remain a powerful and determined advocate for her clients.

Ashley has the unique ability to help people in every facet of their lives during the most emotionally charged and stressful times. She is relentless and works hard on the behalf of her clients to assure that her clients are represented strategically at all stages of litigation.

Ashley is a skilled litigator and criminal defense lawyer who has honed her practice from painstaking and detailed preparation in advance of trial, as well as a keen understanding of criminal law and what it takes to be successful in the courtroom.

Ashley is always upfront, honest and transparent with her clients. She makes sure her clients are included in every step of the litigation process, while at the same time tirelessly defending them and protecting every step of the way. Ashley has a no ‘BS’ personality which will make you appreciate the kind of person she is and when she promises you something, she will always deliver.

Ashley approaches each of her clients with compassion, never judging them for the situation they may find themselves in. To Ashley, law is about her clients knowing they have a trustworthy and capable lawyer on their side who will ensure they are fully protected and represented in Court or in settlement negotiations. Ashley grew up with the vision of helping people and to this day, nothing makes her happier than leading her clients through the storm and into the next chapters of their lives.

Ashley practices in the areas of criminal defense, personal injury, worker’s compensation, wrongful death, and estate litigation.


Ashley grew up in Harrisburg, South Dakota, where she always had dreams of being an advocate. Her passion led her to the University of South Dakota where she received a degree in criminal justice. Her next steps immediately took her to the doors of the University of South Dakota School of Law.

After receiving her law degree, Ashley began her career by representing people accused of crimes. She became a successful criminal defense lawyer because she threw her heart and soul into each case without expecting anything in return. After honing her skills in criminal defense, Ashley dove into civil litigation where she has successfully represented clients in the most complex civil cases against the toughest opponents. Her intuition and honesty are the main ingredients to her uniqueness which has made her a successful advocate in all areas of law.