druggable

Hi guys, I was lucky to enough to be admitted to my choice program. However, I'm currently working in a related industry and am developing skills that would potentially be helpful in graduate school. For various job-related and personal reasons, I'd like to defer my admission for a year (I'd start in the fall of 2019). Does anyone have experience with this process? What is the best way to approach this? Perhaps speak with the admissions officer on visit weekend? Write an email, and if so before or after accepting the offer? Please let me know your experience. Regards.