Friendly, community-driven, and deeply passionate about his work, Johnsen isn’t just another attorney—he’s a trusted advocate for families and businesses navigating complex legal matters.
As the founder and managing attorney of Praesidium Law, PLLC, Johnsen specializes in probate, trust, and business law. With years of experience as a litigator and estate planner, he’s licensed to practice in Arizona and the United States District Court. His legal footprint extends far beyond the East Valley, representing clients across the nation and even overseas. “I’ve appeared in nearly all the Arizona Superior Courts,” Johnsen shares, “and I also represent and advise other attorneys and mediators.”
Expertise Rooted in Experience
Johnsen’s practice focuses on probate and business litigation, as well as estate and business planning—but what sets him apart is his firsthand experience in the courtroom. “I don’t just draft estate plans in theory—I’ve seen what works and what fails in court,” he explains. His background in litigation gives him a unique advantage in crafting estate plans that hold up over time, ensuring his clients' wishes are honored without legal complications. “I will always look for ways to incorporate my experiences into my estate planning to avoid any future issues for my clients.”
Midwest Roots, Arizona Heart
Originally from Northwest Indiana, Johnsen has called the East Valley home for over 25 years. His dedication to service runs in the family—his father, a retired police officer and detective, now works as a felony prosecutor in Indiana, while his mother spent nearly 30 years working for the Kyrene School District.
Despite his Midwest upbringing, Johnsen has fully embraced Arizona. “I love everything about this state—the landscapes, the seasons, and most of all, the people,” he says. Outside of his practice, Johnsen enjoys spending time with his family and supporting his children’s education and extracurricular activities. He takes full advantage of Arizona’s diverse landscape, engaging in camping, outdoor adventures, and sports. His commitment to an active lifestyle extends to Spartan races, golfing, bowling, and playing on a recreational softball team—a testament to his belief in the balance between professional and personal fulfillment. While he values his Midwestern upbringing, Johnsen considers Arizona home.
Giving Back to the Community
Beyond his legal work, Johnsen is deeply invested in his community. He serves as an active board member of the Chandler/Gilbert YMCA, an organization close to his heart. “The YMCA provides a safe, affordable, and positive place for kids to grow, develop character, and have fun in after-school programs,” he shares. Through donations, fundraising, and volunteering, Johnsen is committed to making a difference in the lives of local children.
Why Estate Planning Matters
Many people may not realize the importance of estate and business planning until they face a crisis. Johnsen and his team at Praesidium Law work to ensure that individuals and families are protected both during their lifetime and after their passing. “A comprehensive estate plan isn’t just about assets—it’s about protecting your rights while you’re alive and ensuring your loved ones are taken care of after you’re gone.” His goal? To make the process straightforward and stress-free, giving his clients peace of mind for the future.
"I will always look for ways to incorporate my experiences into my estate planning to avoid any future issues for my clients."