Left-leaning institutions produce left-leaning personnel? Well now I've heard everything.
No, almost all academic institutions lean left. It's an inherent quality of being liberal - having an open mind and willing to embrace change and learn new perspectives. This is why the more educated someone is, on average, the more they tend to lean left. Expanding your knowledge and awareness naturally creates a more liberal person.
Conservatives would rather look back through rose tinted glasses at the past, than come up with solutions for the present - isn't that what maga stands for? Returning to some mythical time when America was perfect? Before civil rights, before women could vote, before unions and child labor laws, before workplace safety regulation, environmental regulation, etc., etc etc. All you conservatives today take all of this for granted. Breathing clean air, not biting in to bread made with saw dust, not having to have your kids go to a school that was built over some type of a hazardous materials dump, I could go on all day. All of those things, and basically every facet of your life right now was brought about by protest and progressive, liberal thought. If conservatives truly had their way, you would be working in a company town for $1 a day, 7 days a week, 12 hours a day. If conservatives had their way, your boss could legally short you on your paycheck and you would be able to do nothing about it.
That's what education is. Obviously, someone who is more "conservative", is more anchored in tradition and resistant to change. Closed minds, in general, don't mix with endeavors that require accepting change.
Has nothing to do with "left leaning institutions" indoctrinating people. Liberals don't believe in hierarchies - conservatives make it a focal point of their entire ideology, after trickle down of course.