Account Manager applicants have rated the interview process at Brown Advisory with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 64.5% positive. This is according to Glassdoor user ratings.
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Very thorough, but fair. I was one of the finalists and had a number of interviews as well as number of tests/projects. I would say the process is long, but the questions asked aren't tricky. I believe they are to get sense of strengths and weaknesses.