Joseph Sierra

Joseph Sierra is a skilled professional with extensive experience in digital forensics and legal compliance. Currently serving as the Manager of Digital Evidence and a Certified Digital Forensic Examiner at Cornerstone Discovery, Joseph leads the forensic and e-discovery unit, overseeing case reviews and workload allocations. Prior roles at T-Mobile included Senior Testifier, where leadership, policy development, and process optimization were key responsibilities. Joseph also provided expert testimony as a primary testifier and contributed significantly to the creation of T-Mobile's Trial Team. Earlier experience as a Legal Compliance Specialist II and Legal Assistant equipped Joseph with strong analytical and organizational skills. Joseph holds a Bachelor of Arts in Criminal Justice/Law Enforcement Administration from Rutgers University and a Master of Science in Criminal Justice/Intelligence and Forensic Data Analysis from Saint Joseph's University.