If you have the need to search for a particular physician in the United States, it is no longer difficult, thanks to Doximity. I remember flipping through pages of pages of the phone directory, now we have this social networking website for doctors, and it is no longer time consuming. 

In fact, if you are looking for Robert Mirsky MD, there are various ways. You could search by name, specialization or city. And that's just to name a few of the search filters.

I once read about mistakes doctors make (scary, isn't it?) and found that the reason is because of doctor miscommunication. The high percentage of such cases could be drastically reduced, if doctors are online and easily accessible. In fact, Doximity's mobile applications make it so much easier to get connected.