They found my information via Monster.com and called me for an initial conversation. Afterwards, I spoke to a woman from what I believe was human resources in the New Jersey office. We had a brief interview where she asked about things on my resume, what I had done during college, etc. The next day I received a phone call saying they wanted me to come down to the office for a full interview.
They flew me from my school and sent a driver to pick me up from the airport and take me from the airport to the office (all expenses paid). I was then interviewed by one woman who gave me a lot of behavioral questions again as well as a few directed specifically to McMaster-Carr and figuring solutions to the problems she proposed.
The next leg of my interview consisted of a walking tour of the office, more questions about what I was seeing, and then another behavioral interview about my time in college and the like.
It was a very laid back interview process and I was impressed with how passionate these people seemed to be about their work.