Semi-Colons

Long lists with commas: We had four professors on our committee: Paul Aleshnick, Professor of Engineering; Craig Kunimura, Professor of English; Marsha Jones, Professor of Linguistics; and Ruth Johnson, Professor of ESL.

Closely related clauses: Suzie never goes to bed this early; she must be exhausted from final exams.

Two clauses connected with an independent marker word: Mr. Ohta has offered to lead the cheerleader team; however, there are other faculty members interested in the job.