I have checked google and I get different opinions on what is appropriate to put in an acknowledgement page. Basically, I thank my school, my advisor, a couple fellow grad students, and then my immediate family. But, I also include two sentences to thank a former professor and a former coworker who both have helped me a lot academically and technically before I started my grad school program, but they had nothing to do with my work in grad school. Is this appropriate to include the former professor and coworker in my thanks? I think I owe them a lot, but I know I can't thank everyone under the sun and I don't want to upset my advisor if I'm thanking others who he doesn't even know or is aware of.