About Us Tummel and Casso are personal injury and civil lawyers located in McAllen, Texas. Our attorneys have been representing and advising clients for over 20 years. Our services include: birth injuries, personal injuries, wrongful death, commercial disputes, real estate disputes, loan disputes, contract disputes, wills, trust and probate cases, regulatory disputes, fraud cases, collection cases, utility disputes, professional malpractice, product defect cases, and intellectual property disputes.