When it comes to academics, I cannot say I know what qualifies a theologian to be a "scholar." Sometimes scholarship is in the subjective eye of the beholder. Usually we look at things like academic credentials and academic works.
When it comes to creating a list, there are way too many names to choose from. I will certainly miss some big ones, so please pardon my omissions. I am going to take my best guess as to which are both true scholars and most respected (which can be two different things).
By Dispensationalist, I am using a very broad definition, including Progressive Dispensationalists and Messianic Jews --- basically any who understand God will keep His promises to the genetic descendants of Jacob and will exalt Israel during a literal Millennium. Most ont the list are traditional dispensationalsits.
Please feel free to comment as to why you like a certain scholar.