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Expert has studied how police collect eyewitness identification evidence for over 30 years. His work includes developing and testing alternative identification procedures that have been widely adopted by police (e.g., sequential lineups). More specifically, he has conducted and published research on the following topics: finding suspects using descriptions of criminals, facial composites, and mug shots; identification of suspects using mug shots, showups, and lineups; factors that bias identification procedures (increase error rates); "postdicting" identification accuracy (factors that suggest the witness is more versus less likely to be correct); and belief (credibility) of identification evidence in court. He has taught or trained police officers, prosecutors, defense attorneys, and judges. He has consulted about eyewitness identification issues on three continents.

Expert recently (May 2009) testified in Ottawa in a voir dire to determine the admissability of identification evidence in a murder trial.Expert testified in Newmarket Ontario (April 2008) in a voir dire to determine the admissability of identification evidence in a trial concerning multiple bank robberies.In 1998 Expert was called to testify before a world court in Arusha Tanzania as part of a Rwandan genocide trial. Expert testified about eyewitness identification procedures before a courts martial in Dubrovnik Croatia in 1997.Expert consulted during 1990 and 1991 with the Ontario Police College to modify their training procedures regarding eyewitness identification procedures.