Being a PhD science professor is a highly skilled job. There aren’t many openings: society needs some, not a bunch, and they last a long time. The barriers are mostly measured by the time involved.
Don’t look for much pay.
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I total disagree with your statements. That is not my experience with Science and Engineering professors.
Many of them love to teach their subjects. Many of them write books and do lectures. Many of them are consulted by industry and government on leading edge technology, new regulations, and research. Many of them become members of societies in the fields of expertise. Some of them end up being part of National Academy of Science, National Academy of Engineering, College Deans and Chancellors, Some consult with NASA, DOE, NRC, FAA, EPA, NIH, and many other federal and state agencies.
These people get paid for consulting, book publishing, lectures, and membership in some organization.
Here is an example that might of interest you. Patrick Gallagher is currently the Chancellor of the prestigious University of Pittsburgh which is a very high paying academic position. He has just told the University that he wants to return to teaching Physics and Astronomy by the summer of 2023.
“My plan, come summer 2023, is to transition to the faculty as a professor in our Department of Physics and Astronomy. After all, teaching physics was the goal that originally brought me to Pitt in 1986 to get my doctorate, so for me this is a dream come true!”
http://pittsburgh.imodules.com/controls/email_marketing/view…
The brightest minds are in academia - just chasing dollars is not very satisfying for many Scientist and Engineers.
Jaak