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About Me

   I am an attorney in McKinney, Texas serving Collin, Dallas and the North Texas area.  I have a practice focused  on delivering superior represenation in State and Federal criminal cases.

   I am a fomer prosecutor and and have spent my entire career practicing criminal law and procedure.  I am continually striving to stay abreast of the developing law and practices in my field and am committed to use my knowledge of the law and courtroom experience to the benefit of clients.



Photos and Videos

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Practice Areas


  1. Criminal Defense: 100%
    17 years, 1 thousand cases


Payment Types:

Cash, Check, Credit Card

Attorney Endorsements

18 total 

  • Ryan Michael Kreck

    Derk provides zealously represents his clients and does not back down on any tough case.


    Ryan Kreck Family Attorney
    Relationship: Co-worker

  • William C. 'Coleman' Sylvan

    I endorse this lawyer.


    William Sylvan Criminal Defense Attorney
    Relationship: Fellow lawyer in community

Contact Info

Rosenthal & Wadas, P.L.L.C.

4500 West Eldorado Parkway, # 3000
McKinney, TX, 75070-5758


TXEligible To Practice In Texas 200409/19/2015

Professional Misconduct

We have not found any instances of professional misconduct for this lawyer.
Avvo Contributions
Legal Answers
Award NameGrantorDate Granted
Super LawyersThomson Reuters2015
Super LawyersThomson Reuters2014
Top 100 Trial LawyersNational Trial Lawyers Association2014
Board Certified - Criminal LawTexas Board of Legal Specialization2011
Work Experience
TitleCompany NameDuration
PartnerRosenthal & Wadas, P.L.L.C.2010 - Present
Managing PartnerThe Law Office of Derk A. Wadas2005 - 2010
Assistant District AttorneyCollin County District Attorney's Office2004 - 2005
Deputy State's AttorneyFranklin County State's Attorney's Office1999 - 2004
Association NamePosition NameDuration
Association of Federal Defense AttorneysN/A2013 - Present
Bar Association of the Fifth Federal CircuitN/A2008 - Present
Texas Criminal Defense Lawyers AssociationN/A2005 - Present
Collin County Criminal Defense Lawyers AssociationVice President2005 - Present
Standardized Field Sobriety TestsCertified PractitionerN/A
Legal Cases
Case NameOutcome
State of Texas v. C.N.Not Guilty verdict
State of Texas v. L.L.Not Guilty verdict
State of Texas v. C.P.DWI case dismissed on day of trial by District Att
See all Legal Cases 
School NameMajorDegreeGraduated
Vermont Law SchoolLawJD - Juris Doctor1997
Wilkes UniversityN/ABA - Bachelor of Arts1994
Speaking Engagements
Conference NameTitleDate
Monthly MeetingNavigating the Criminal Law Emergency2013
Collin County Criminal Defense Lawyers Association meetingThe Basics of a Federal Criminal Case2012
Vermont State Police Academy: Adjunct InstructorDUI: The Legal Environment2003