Yes, graduate students can often request specific peer reviewers for their dissertation, but it depends on the institution and the department's policies. In some cases, students may have a say in choosing the reviewers, while in others, the decision is left to the student's advisor or committee. Typically, students are provided with a list of potential reviewers from which they can choose, and some departments may even offer an opportunity for students to submit their own proposal for specific reviewers. It's worth noting that not all institutions allow for this level of input, so students should check their department's policies before requesting specific reviewers. Requesting a familiar reviewer can also help alleviate some anxiety, providing reassurance and support throughout the dissertation process.