There has been a significant increase in the frequency of expert testimony over the past 25 years in Canada. As such, there has also been an increase in psychological expert testimony In drawing from his experience as a litigator and judge, and reflecting on the articles by Yarmey and Peters, the author explains what it is that judges expect of an expert and how experts should be prepared. He also summarizes some of the legal rules concerning expert testimony Finally, the author considers the future of expert psychological testimony.