Here’s a video in which renowned portrait photographer Nadav Kander discusses his approach to photography and portraiture. One thing that’s interesting about Kander’s method is that he tries not to connect with his subjects prior to photographing them:
I really like the connection that human beings have when there isn’t a great knowledge, like when you first meet people. I would find it very, very hard to photograph a friend well, or to photograph somebody that I knew well. I think that that tension when you first meet people allows you to communicate without speaking
He does, however, make it a point to get to know their appearance… for the purpose of knowing who they are when they walk into the studio.