If you go a private instructor route - vs. a junior college, etc. then the key is to communicate with a few instructors to make sure they understand what you want to learn (as an example, a classical piano teacher is not going to give you waht you want) and then select the teacher who you feel best about.
Most music stores lease out space to instructors and can likely provide you with the names of the people who teach - I would think there would be many options in the New Jersey area.
Again - decide what you hope to learn. Maybe you want some theory (to understand chords progressions, etc.) - maybe you simply want someone to teach you a new rock song each week, etc. - make sure the instructor understands what you want and if your expectation are reasonable.
If you are just starting out - then you may have to suck it up and have a piano teacher teach you some scales and correct technique. However, if you already have some chops and you are simply hoping to expand your knowledge.....than communicating to find the right teacher becomes more important.
Also - keep in mind that most musicians eventually "outgrow" one instructor. Each teacher teaches a certain way (normally based on the way they were taught) - at some point the student feels they need to learn more form a different teacher.