Author: thesis, "Constitutional Rights," 1994. This work received the award to the best thesis of the Law School of the University of San Carlos de Guatemala in 1994. Joined the firm in 2003. Prior to joining the Firm, Mr. Mazariegos worked in the Constitutional Court as Legal Advisor, Final Decision Officer, Specific Officer of the Magistracy, Legal Advisor of the Magistracy; and Lawyer of the Department of Interior. He has been professor of the Law School of Rafael Landivar University, teaching the courses of constitutional law, administrative procedural law, and constitutional jurisdiction. He has been invited to lecture lawyers and judges about constitutional jurisdiction in programs of diffusion and updating of the constitutional justice sponsored by the Guatemalan Constitutional Court. Mr. Mazariegos is a senior lawyer of the litigation practice group, handling a wide variety of issues in the areas of constitutional, civil, commercial, criminal and administrative law as well as arbitration. He has been part of legal teams managing high-profile white collar lawsuits, where conviction verdicts have been obtained. He has also been part of legal teams in lawsuits filed against individuals in connection with tax fraud, customs smuggling and money laundering. Mr. Mazariegos' knowledge in those practice areas originated in the Guatemalan Constitutional Court, where he worked as an Advising Lawyer for 10 years. He drafted judgments on claims of unconstitutionality of general laws and of unconstitutionality in concrete cases. He also drafted writs and judgments on constitutional defense actions in civil, criminal, labor and administrative matters. During the coup d' État of May 25th 1993, he contributed to draft some of the writs and judgments required to reestablish the constitutional order in the Republic. For 7 years as a Lawyer of the Department of Interior, he issued legal opinions regarding the constitutionality of international treaties and bills of the Congress of the Republic.