teaching - Why do some professors with PhDs leave their professorships to teach high school?

I can surmise that some of them mightn't have gotten tenure and needed to find another job, but wouldn't these former professors be bored teaching the same (relatively basal) material yearly?

Let me know of other examples, but I was riffling some fee-paying schools and lighted upon:

• 
  

  Audrey Budding, of the Harvard Academy for International and Area Studies

  
  

  
  

  B.A., Swarthmore College 1982
  B.A., University of Cambridge (UK) 1984
  M.A., Harvard University 1991
  Ph.D., Harvard University 1998

  
  

  
  


• 
  
  

  Eric Casey, former Associate Professor of Classics, Sweet Briar College. Now at Trinity School NYC.

  
  


• 
  

  David Gomprecht at Dalton School.

  
  

  
  

  Gomprecht, PhD, graduated from Wesleyan University, where he majored in mathematics and physics, and then went on to receive a Ph.D. in mathematics from the University of California at Berkeley. After working as a research mathematician for a few years, David returned to his hometown of New York City, where he has now been a math specialist and private tutor for over twenty years.

  
  

  
  


• 
  

  Mara Naaman at Dalton School.