National District Attorneys Association
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Contact Us

Contact us via our general National Traffic Law Center email at
or contact a specific staff member, listed below.

Joanne Thomka

Joanne Thomka Program Director

Ms. Thomka was a Senior Assistant District Attorney for the Onondaga County District Attorney’s Office in Syracuse, New York prior to joining the NTLC in 2006. She was the Bureau Chief of the DWI Unit from April 2000 – August 2006, responsible for the prosecution of all alcohol-related crimes and all vehicular fatalities. Ms. Thomka was previously a member of both the Special Victims and Violent Felony Bureaus within the Onondaga County District Attorney’s Office. She is a graduate of Salem State College and Vermont Law School.



Dave Hollenberg Staff Attorney

Dave Hollenberg joined the National District Attorneys Association in November 2014, and serves as a staff attorney with the National Traffic Law Center. Prior to NDAA, Dave worked as a fellow, and as a special Assistant State’s Attorney with the Montgomery County State’s Attorney’s Office for nearly two years, prosecuting hundreds of criminal and traffic cases, and assisting with more complex jury trials. He has also worked in civil litigation. Dave received his undergraduate degree from Dartmouth College and his law degree from American University Washington College of Law.



Duane M. Kokesch Senior Attorney

Duane M. Kokesch is a Senior Attorney with the National Traffic Law Center, a division of the National District Attorneys Association (NDAA). Mr. Kokesch has more than 16 years experience litigating criminal cases, beginning as an Assistant City Attorney with the City of Grand Rapids, Michigan where he prosecuted driving under the influence and other local crimes. He also worked as an Assistant Prosecuting Attorney in Calhoun County, Michigan and an Assistant Attorney General for the Office of the Attorney General for the District of Columbia. In 2006, Kokesch was appointed Chief of the Criminal Section for the Office of the Attorney General for the District of Columbia. As Chief, he oversaw the prosecution of routine and high profile drug and alcohol traffic-related offenses in the District of Columbia as well as other crimes. Prior to joining NDAA, Kokesch worked in private practice with a focus on criminal litigation.  He is a cum laude graduate of Thomas M. Cooley Law School and holds a master’s degree in criminal justice from St. Cloud State University. 



Metria Hernandez photo

Kristen K. Shea Senior Attorney

Ms. Shea comes to the NDAA by way of the Tennessee Governor’s Highway Safety Office where she worked as a program manager for the DUI courts and multiple law enforcement grants. Prior to that, she served as a prosecuting attorney for almost 10 years with the majority of her time spent as an Assistant District Attorney in Nashville, Tennessee. She worked as the team leader of the Vehicular Crimes Unit, specializing in traffic-related criminal offenses at the state trial court level. Ms. Shea is a graduate of Trinity University and University of Memphis College of Law.