I have long been a big fan of Saskia Sassen’s work. You can read my review of her latest book, Expulsions, here. Sassen gave us the concept of the global city, a place where global flows congregate and clash (as is reflected in the toon above), where the extreme power of the processes of global capitalism encounter the expelled elements of it.
It is also in Sassen’s sociology that one can read about how the nation-states have not disappeared under global conditions, but have reconfigured themselves as part of global assemblages that contribute to global processes, and do indeed process global mechanisms at the national level. The very concept of assemblage is one that is important in Sassen’s work as it brings together elements that are usually conceptualized separately. Again, it is something demonstrated in an accessible manner in Expulsions. I cannot recommend that book enough as, I think it is a highly readable entry point into Sassen’s work. Then, one can work one’s way into more complex work.