The interview was intensive, in my opinion. The entire process lasted about three weeks and consisted of four rounds. I applied online and was contacted via email a week or two later to set up a phone interview. The interview went well and she indicated at the end of the call that they would like to set up a second phone interview. We set that up for the following week. A couple days after the second phone interview, I received an email that said I had progressed to the next phase, which was a case study. It's basically a sample of the work you would do for GLG. It had a turn around time of a few days. I submitted it and was invited within a couple days to interview in person. I am comfortable with in-person interviews, but found this to be the most difficult part simply because of the length and nature of the questions. The whole thing lasted two hours and consisted of 4 30-minute interviews, some with single and some with multiple interviewers. This is really a mental marathon, so study some possible questions and be prepared. It is a lot of repetition, the interviewers will ask many of the same questions. I took all the questions off of Glassdoor (even for different positions) and prepared them in advance - every question they asked was one I'd already looked at and was prepared to answer! Make sure you know the GLG business model, can present a picture of the responsibilities of the job you are applying for, and can talk about/spin your weaknesses (and strengths) as an employee - you will get these questions over and over. A couple days after my in-person interview, I received an offer via telephone.