Final answer:
A forensic psychologist would be involved in witness preparation and jury selection, providing expertise in both reducing witness suggestibility and aiding in the selection of impartial jurors.
Step-by-step explanation:
The type of psychologist who would be involved in witness preparation and jury selection is known as a forensic psychologist. A forensic psychologist applies psychological principles within the legal system to help legal professionals understand the psychological aspects of a case. During a trial, these psychologists can be instrumental in witness prep to ensure they are questioned in a manner that reduces suggestibility and improves the accuracy of their testimony. In terms of jury choosing, they employ their knowledge of social behavior and decision-making to assist in the selection of impartial jurors by identifying potential biases or preconceived notions that may affect the outcome of the trial.