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    Administrative personnel oversee the operation of the Medical Examiner’s Office and manage quality control and assurance processes.



    Nizam Peerwani, M.D. Chief Medical Examiner

    Nizam Peerwani, M.D.
    Chief Medical Examiner

    Dr. Peerwani is a graduate of the American University of Beirut (MD '76).  He completed his residency in pathology at Baylor University Medical Center in Dallas, and is board-certified in clinical, anatomic, and forensic pathology.  Currently he is the Chief Medical Examiner for Tarrant, Parker, Denton, and Johnson counties in the state of Texas and has held this position since July 1979.  His academic affiliations include the University of North Texas Health Science Medical Center and Baylor College of Dentistry as a Clinical Adjunct Professor.  He is an advocate for child safety and served on the Texas Child Fatality Review Team as an expert in forensic medicine.  Dr. Peerwani also advocates for human rights and serves as an expert consultant for Physicians for Human Rights with completed assigments in Rwanda, Bosnia, Indonesia, Cyprus, Afghanistan, and Israel for genocide and human rights violations under the auspices of the United Nations Tribunal.



    Ronald L. Singer, M.S.

    Ronald L. Singer, M.S.
    Technical and Administrative Director

    Ronald Singer received a Bachelor of Science Degree from Tulane University and a Master of Science Degree from Loyola University of New Orleans.  A forensic scientist since 1972, he has served as President of the International Association of Forensic Sciences, is a Fellow and Past President of the American Academy of Forensic Sciences, a Distinguished Member and Past-President of the Association of Firearm and Toolmark Examiners, an Emeritus Member and Past Secretary of the American Society of Crime Laboratory Directors, and is a member of numerous other forensic associations and committees.  He has been an invited speaker on forensic issues throughout the United States, Hungary, Bosnia, England, Portugal, Turkey, the Maldives and Sri Lanka. Mr. Singer is a recipient of the American Academy of Forensic Sciences Criminalistics Section Outstanding Service Award, the Association of Firearm and Toolmark Examiners Member of the Year Award and the Gold Medal of the Mediterranean Academy of Forensic Sciences.



    Chris Heartsill, B.S.

    Chris Heartsill, B.S.
    Quality Assurance/Quality Control Manager


    Chris Heartsill received his B.S. degree in Chemistry from East Central University in 1991.  Chris has been working in analytical chemistry for over 20 years with more than 18 years of forensic toxicology experience, including the areas of human performance forensic toxicology and postmortem forensic toxicology.  Prior to coming to Tarrant County in 2013, he served as an analytical chemist, toxicologist, quality manager, and technical supervisor in the breath testing program.  He is currently certified by the American Board of Forensic Toxicology as a Forensic Toxicology Specialist.  Chris is an active member of the Society of Forensic Toxicologists, Southwestern Association of Toxicologists, and the Association of Forensic Quality Assurance Managers, and is actively involved in the accreditation of forensic laboratories through volunteer activities with the American Society of Laboratory Directors – Laboratory Accreditation Board.



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    100 E. Weatherford, Fort Worth, Texas 76196