If he is your Statistics TA, I would suggest attending his review sessions, doing the problems in advance and bringing questions. It was good to chat with him and catch up on what is new in the life of a PhD. Steve and Srini are just representatives of their number. Interaction with EMBA and PhD students is normally quite limited. Traditionally, we meet other MBA students in class, through our involvement with clubs and special events. This rarely happens with EMBA and PhD students.
Scheduling is one of the biggest problems.
Most MBA students would like to avoid campus on those days, and we spend much of our time in Uris, limiting the chance for paths to cross. Schedule an event that will be convenient to as many people as possible. The event has been scheduled. This is to be the first all students event held at Columbia Business School. Every EMBA, PhD and MBA student is invited to attend.