Derk is a former Collin County Assistant District Attorney where he served a felony criminal prosecutor and was the chief misdemeanor prosecutor in different County Courts at Law. As a prosecutor, Derk tried over seventy-five cases to a jury and successfully handled hundreds more. As a defense attorney, Derk has only increased the number of cases he's tried to a jury and has achieved numerous “Not Guilty” verdicts, charge reductions and outright dismissals.
Derk was selected to the Texas Super Lawyers list for the past five years. This recognition is given to less than 5% of the attorneys in the state. Additionally, he has been board certified in criminal law by the Texas Board of legal specialization since 2011.
It is very important to Derk to remain at the forefront of the developing law and defenses in his field. For this reason, he is a member of organizations such as the Collin County Criminal Defense Lawyers Association, the Texas Criminal Defense Lawyers Association, the Bar Association for the Federal Fifth Circuit, and the Association of Federal Defense Attorneys.