My job, as a tenured associate professor of biology, wouldn’t be possible without a sizable crew of adjunct instructors in my department.
Here is some context about the role of adjuncts in my particular department: At the moment, the ratio of undergraduate majors to tenure-line faculty is about 100:1. This isn’t unprecedented, but is on the higher end of laboratory science departments in public universities. Because we have so few tenure-line faculty, and so many lectures and labs to teach, we hire a slew of adjuncts every semester.
It’s not like the adjuncts are there to make life easier for tenure-line faculty. They’re here to keep the department from falling apart and to teach classes that otherwise we would be unable to teach. One thing that keeps us tenure-line faculty busy is advising. All of our majors required to be advised every semester in half-hour appointments, one-on-one with tenure-line faculty, in order to be able to register for the subsequent semester. In addition to our base teaching assignment of four lecture courses per semester and the standard research and service expectations, we’re worked mighty heavily.