The FBO on the field is Energy Aviation, +1 (570) 368-2651. The FBO is on the West Ramp. Operating hours are 0630-2100 LCL. After-hours fuel by prior arrangement.
Canyon Aero LLC provides aircraft maintenance services.
Canyon Aero LLC rents aircraft and has flight instructors on staff.
There are several other CFIs in Williamsport, at least half a dozen, probably a dozen or more. I'll add them to a list here as soon as they give me their preferred contact info.
You can learn to fly Light Sport aircraft at AvSport of Lock Haven. LSA rentals and maintenance available.