There are two basic points I'm making, which perhaps need to be clarified.
1) PsyDs are not
as well trained in stats/methods to teach psych classes. I'm not talking about teaching statistics/methods. Even for a large lecture class like intro to psych or abnormal psychology, you need to be able to critically evaluate research and have pretty good breadth/depth understand of the literature in order to teach the class properly. Sure, there are some professors that basically teach from a slidedeck, or right from the outline of a textbook, but they are doing a disservice to their students.
For example, even if you're teaching a clinical course on CBT, most PsyDs will know how to do cognitive restructuring pretty well with a patient, but do not know the literature on the empirically efficacy of specific cognitive therapy techniques, and critically evaluate the seminal papers that have come out in the past few years, arguing for and against them.
2) Tenure-track faculty decides who gets to be a lecturer, and who teaches what. Non-tenure-track faculty (both PhD and PsyD) usually do not get to teach the big-time lecture courses. Adjuncts usually teach the classes that none of the permanent faculty want to teach, or teach temporarily when tenured faculty are on sabbatical, or summer courses, small seminars. The less prestigious the institution (and the less money it has, so they love to hire lecturers cheaply), the less this is true. If you teach at Middle-of-Nowhere-U, you're more likely to be able to teach.
As a PsyD, you've got a lower shot of getting such a position. It's certainly not impossible, but you're basically at a disadvantage, and have to prove yourself to the tenure-track PhD faculty. You don't have to believe me. Just look up where you want to teach, and look at the credentials of the lecturers.
For example, for University of Central Florida (UCF), look at their faculty page:
http://www.psych.ucf.edu/faculty_index.php
I counted 14 lecturers at all the campuses. 12/14 had a Ph.D. Only two had a Psy.D.
- Now let's look at the two Psy.D.s: one actually has won research grants and has professional posters and publications. The other one is a forensic psychology expert, and probably teaches a specialized course on that subject.
If you want another example, let's look at University of Miami:
http://www.psy.miami.edu/department/faculty.html
I count 19 lecturers/adjunct professors. All of them whose credentials are listed online, are Ph.D.s.