If you are on the fence of asking Garvin for help, let me say this: all the reviews are right. Karyn Garvin does an amazing job of explaining behavioral problems, dog psychology, and training techniques.
My girlfriend and I adopted a dog from HSSA who was very reactive (barking, lunging, and pulling) and just recently nipped someone at the dog park. I called Karyn the next day and we made an appointment. We just had a 1.5 hrs session, and my dog's behavior has undergone a miraculous improvement. It's like night and day from where she was before.
Karyn was kind, patient, and understanding. She took her to time to work with us and explain everything so that we understood. Before this, we were running out of options, had tried so many approaches, and were at our wits end. Now, everything is illuminated. We have a clear goal. I cannot recommend her highly enough. 10/10.