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Our Attorneys

Experienced and Strategic.

From your very first meeting in our office to the resolution of your case, you can trust Hennighausen Olsen & McCrea, L.L.P. to be professional and relentless. We’ve built upon the successes of our legal careers and combined experience.

Come in and meet our team.


Mitchell E. McCrea

AJ Olsen.jpg

A.J. Olsen

United States Court House
In Memorium

Fred Hennighausen, 1924-2017

Mr. Hennighausen, more often known as Mr. H, founded the firm with A.J. Olsen in 1985. After serving his country during World War II, Mr. H earned a Bachelor of Science in General Engineering and a Bachelor of Science in Mechanical Engineering from Duke University. Mr. H worked for the New Mexico Office of the State Engineer for many years in Roswell, NM. He retired as District II Supervisor, and decided to start a second career as a water lawyer. After graduating from University of Tulsa, Mr. H returned to Roswell in 1983. Without him, our firm would not be the leader in water law on the Pecos River and in the Roswell Artesian Basin that we are today.

Hon. Alvin F. Jones, 1944-2019

Judge Jones was a pillar of the Roswell community during his time on the Fifth Judicial District Court bench and in private practice. As a partner with the firm, Judge Jones worked on numerous water issues across New Mexico and maintained an active pro bono practice. His legal career as a private practitioner, jurist, and community servant spanned more than five decades. A lifelong New Mexican, he knew the importance of giving back to the state, his local community, and preserving our water resources.

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