Some expert in my area:

In geography there is much experts because geography is very diverse in your area of study. For example in topic more ambiental (biogeography, geology, climatology) exist in each area a expert.
 In topic as glaciology is Francisco Ferrando in the university of Chile, geographer that specialized, He stands out in glaciology is a topic very complex that include various subsystems .
 In areas more social Is a american, "David Harvey". He speak of geography marxista, that based on the contradiction of capital as construction of the modern society. Based on the Marx's capital, It postulates that every territory is in inequality for whom they possess the means of production since they are they who have the control.  In continents as Africa or América Latina the countries more "developed" have the economic control. But to be free they have to take the power and control of his territories,

In spite of being recognized in the whole world it is those who criticize it for supporting theories or western readings to a not western world that has his own dynamics.