If you need to transition labs, for whatever reason (research interests changed, personalities aren't jiving, etc.), there are some things that you should do.

1) First, see your GSAO and the head graduate advisor (currently Ian Wang) and let them know what you are thinking of.

2) Speak with your new guiding professor to make sure they are on board with taking you as their advisee (this is crucial).

3) Next, you can talk to your guiding professor. This might be awkward given the particular situation, and you do not have to do this.

4) GTo make things official, go see your GSAO to get the paperwork. Depending on your stage, you might need to fill out a form for a "Change in Dissertation Committee". There might be other minor logistics, such as funding/appointment issues that need to be sorted out.

5) Changing labs might also affect your financial status. For example, the funding that your previous advisor promised will be invalid if you change labs. Bring this up to your new advisor or the department. 

Switching labs is not uncommon. Unfortunately there are sometimes lab switches that are "hostile." In these cases, you should ask the Head Graduate Advisor and your GSAO how to proceed. If things get really messy (data access issues, intellectual property, inappropriate behavior, etc.), there is an on-campus Ombuds that you can see. You may also likely need to meet with your Division Chair and with the Departmental Chair.  We also recommend talking to your peers or colleagues with experience switching labs.