there is so many academics writing about modern cinema, I would start with David Bordwell with his essays on website here: http://www.davidbordwell.net. Especially this one is helpful with studio systems: https://www.amazon.com/Minding-Movies-Observations-Business-Filmmaking-ebook/dp/B00511MRFY/ref=sr_1_5?s=digital-text&ie=UTF8&qid=1502670175&sr=1-5&keywords=bordwell and of course his book Film Art. But that's like the absolute basics. Then few other interesting names: James Monaco, Rick Altman, Francesco Casetti and the list goes on and on, but this could a be good start point.