Diane M. Johnsen

4.4 (40 reviews )

Phoenix Arizona United States

Appellate Practice Commercial Litigation Environmental Law

Recognized in Best Attorney USA since 2005

602-351-8000 Website

About Diane

Diane M. Johnsen is a top attorney recognized by Best Lawyers in the practice area(s) of Appellate Practice, Commercial Litigation and Environmental Law.Diane M., who practices law in Phoenix, Arizona, has been recognized since 2005. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Diane M. is held by other top lawyers in the same geographic and legal practice area.

Diane M. Johnsen is a top attorney recognized by Best Lawyers in the practice area(s) of Appellate Practice, Commercial Litigation and Environmental Law.

Diane M., who practices law in Phoenix, Arizona, has been recognized since 2005. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Diane M. is held by other top lawyers in the same geographic and legal practice area.

Practice Areas

Appellate Practice

Commercial Litigation

Environmental Law

Education

Duke University

Awards & Recognition

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Reviews

4.4 / 5

40 Reviews

1,041 Profile Views

Angelina Simonis-Prohaska

Feb 02, 2026

A very good experience overall with the entire team at Diane M. Johnsen's legal practice

It's hard finding a reliable lawyer these days, but Diane M. Johnsen in Phoenix is definitely one of the good ones. Would use them again if needed without hesitation. They are professional, responsive...

Lorena Considine

Feb 02, 2026

Many thanks to Diane M. Johnsen for the hard work and dedication to my legal matter

Diane M. Johnsen is fantastic and very professional. Don't hesitate to hire them if you're in Arizona and need help. They really know their stuff and will go the extra mile to make sure you're taken c...

Sabrina Kshlerin

Feb 02, 2026

Diane M. Johnsen did a great job handling my complex Appellate Practice law case from start to finish

Willard Buckridge

Feb 02, 2026

Simply amazing representation from Diane M. Johnsen's office during my recent legal matter

Short and sweet: Diane M. Johnsen is the real deal and a true professional in the field of Appellate Practice law. If you're in Phoenix and need help with your legal issues, call them immediately. You...

Dexter Douglas

Feb 02, 2026

Professional service and clear communication provided by Diane M. Johnsen in Phoenix

I've worked with a few lawyers in Phoenix over the years, but Diane M. Johnsen stands out for their honesty and thoroughness. They were clear about the process and kept me updated at all times. I felt...