<p>This is not a new discussion, it went on in my time in college more years ago then I care to count. From what I hear from kids recently graduated we have hired and from kids in college, as others have pointed out, there is no rule on this. There has been a lot of angst about this over the years, that some professors, especially the ‘stars’, often were reluctant to teach lower level or sometimes undergrad courses at all (on the other hand, Richard Feynman always claimed the intro courses in physics kept him young…then again, this was Cal Tech, where freshman physics probably teaches quantum electrodynamics <em>lol</em>). </p>
<p>It also depends on the courses, in my experience and what go on recently, TA’s tend to teach, where used, in the following kinds of classes (and keep in mind this is my experience, which is very limited)</p>
<p>-Things like freshman expository writing courses
-TA’s generally control lab courses and recitations for classes in physics and chem, which makes sense
-Often, in the basic survey courses in the ‘core’ or ‘liberal education’ requirements and such, you will see grad TA’s sometimes teaching (since most of these are intro courses to the major track IME).</p>
<p>-First level math courses, like Calc, often had grad students teaching it</p>
<p>-Intro CS courses. </p>
<p>On the other hand, with science classes like physics or chemistry or engineering courses and such, I never had a TA or heard of one teaching it from my circle of recent college students/grads. Likewise, in core tracks for majors, in almost everything, other then the intro courses it doesn’t seem like TA’s teach much. </p>
<p>Part of the background of this has been something that has been debated for years at the college level, about what makes a great professor. Generally, tenured professors get tenure for their research and writing (the old publish or perish), which doesn’t necessarily make for a great teacher but does bring prestige to their school…and especially since those kinds of professors spend a lot of time on research and such and some feel teaching distracts from the primary work of that research. The dark side of that is assistant and associate profs working towards tenure, who are great teachers and really care about that, often end up getting denied tenure because they don’t have the huge paper trail because they spend much of their effort on teaching. Where TA’s, least from what I can tell, were often used were the classes where the tenure track profs felt it was a waste of time…</p>
<p>These days it also has changed, a lot of colleges are using adjunct professors, who basically are outside contractors who are hired to teach classes for X dollars that semester, and often teach at more then one school and so forth, it is a lot cheaper for the schools to do this, and I wonder if they have replaced TA’s in some of the classrooms (I have no way of knowing). This has changed the dynamic from what I understand, though I suspect tenure track is not totally a dinosaur, since they need their ‘stars’ to attract kids to want to go nuts applying to get into the school:).</p>