It will depend on the specific college or university involved. You have to be mindful as to your school will have specific policies in that regard. It could include professors, administrators. It could include students, graduate students. It can and would vary depending on the school involved. Familiarizing yourself with your school's policies, understanding who may be on a panel, the potential pros and cons of how different schools approach such a matter is an important consideration in terms of best responding to and defending against allegations of academic misconduct. An experienced attorney advisor would be a helpful ally in terms of ensuring a fair process and working towards a favorable outcome.