Who is Heath from Reckless and what is their importance?

Heath is Brandon's roommate. He plans to bring in kegs of beer, so the students can party during Trustee' Weekend, and in doing so, sets in motion the chain of events that leads to the House Arrest of the Dumbarton Girls, and to the secret party that takes place while that house arrest is underway. Perhaps most importantly, his plans are also the trigger to the eventual confrontation with Kara that serves as one of the clearest manifestations of "the importance of self-respect" theme in the book.