There were three Economists that were pretty much the top 3 that students would have dealt with their works back in the day because they wrote the text books that most colleges used to teach the subject and they were Galbraith, Friedman and Samuelson with 2 of these men passing away this year and Samuelson in his 90's now.
Of course there are many others including many Nobel Winners
http://almaz.com/nobel/economics/economics.html that are/were great men but these three were some of the people whose works were studied the most.