As an accredited member of the Public Relations Society of America (PRSA), Ehrhardt has counseled some of the Gulf South's largest companies.  His current client list includes The New Orleans Hornets NBA franchise, Capital One, the New Orleans Redevelopment Authority, the Greater New Orleans BioSciences Economic Development District, Waste Management of Louisiana, and Corporate Realty, Inc. 

He has a Masters of Science in Communications Management from the Newhouse School at Syracuse University.  His capstone project was entitled "Using focus groups to assess the effectiveness of Louisiana's One-Stop workforce investment delivery system," which was a compilation of data and analysis of 16 focus groups in Louisiana. He has taught communications at the LSU Manship School of Mass Communications.

He also received undergraduate and graduate education at the University of New Orleans.  He has a strong commitment to professional advancement, participating in development courses focusing on Corporate Communications and Strategic Planning.  He completed a seminar sponsored by Harvard Law School on Dealing with an Angry Public, authored numerous articles for publication and served as a speaker for seminars and workshops.

Ehrhardt served as an infantryman in the U.S. Army in Vietnam and was later commissioned as an artillery officer in the famed Washington Artillery housed in Jackson Barracks, New Orleans.  He was awarded a Bronze Star Medal and Combat Infantry Badge, along with Vietnam Service Ribbons for his service in the First Cavalry Division.

He has been honored as Executive of the Year by the Greater New Orleans Executive Association, where he also served as president, board member and chairman of several committees. He served on the board of directors for the New Orleans Regional Chamber of Commerce and as president of the University of New Orleans Privateer Athletic Foundation.  Ehrhardt's programs have garnered eight PRSA Silver Anvil Awards.  In 1997, he was awarded the Lifetime Service Award from the University of New Orleans National Alumni Association.  He has also worked Super Bowls, NCAA Final Four Championships, the Republican National Convention and the Papal Visit to New Orleans in 1987.