Phone (30 min) inc. basic behavioral questions that aims to understand what type of person you are & how well you can communicate. "Walk me through your resume" so be concise and be prepared to tell them what you did and the results you achieved.
Final In-Person: Spoke w/5 people who did 1:1 with me. Great office culture & team environment. Each interviewer comes to you versus you having to go around from person to person. Be prepared for a case study on the company's line of work, strategy case study and emphasize WHY you want to work for Mercer (this came up over & over again). Overall, really intelligent group of people who want to make sure you want MMC and aren't considering them as 2nd choice. Ask smart questions, so be sure to read their published books.