I have watched Congressman Keating since his election. He is an strong and dedicated to constituents. I am a Realtor who believes in protecting property rights of homeowners. Congressman Keating understands the housing issues such as Flood insurance, protecting the Mortgage Interest Tax Deduction and other such issues.
Judging for the closed-ness of Apple, you probably won't get much credible answer from Apple's own people. OS X and iOS are primarily written in Objective-C with some C++ in between (e.g. IOKit, WebKit, etc) and probably some C as well for the kernel stuff. However looking at Apple's software engineering jobs vacancies [1], these are also relevant programming languages at Apple: Java.
On your Mac, you can create iOS applications that run on the iPhone, iPad, and iPod touch with Objective-C. Objective-C is Appleâs abstraction of C with influences of Smalltalk used primarily for building iOS and Mac applications. See Also: The Reviews Are In: Android Apps Outshone iOS Apps In 2013.