Penn has a dedicated Comprehensive ALS Center, and you can see the physicians listed there (Lauren Elman, Colin Quinn, Defne Amado). So does Jefferson, and it seems the ALS neurologist there is Hristelina Ilieva.

However, while a comprehensive ALS center is the best place for someone who has ALS, that might not be what a person who is still undergoing work-up needs. These centers are targeted at treating people who actually have ALS, and so they may have criteria about who they see. You might also be able to see someone else faster.