interview invite around mid-January. 1 round of interviews with 2-3 faculties. Around 30 minutes, not too long. Offer around mid-Feb. Different departments and tracks will have different processes and timelines.
Ph.D. Student applicants have rated the interview process at The Johns Hopkins University 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 72.3% positive. This is according to Glassdoor user ratings.
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