Susan Costello, MA, LMHC, CPCC is a licensed counselor and certified professional life coach. Susan Costello is renowned as a relationship and marriage counselor. Relationship counseling, couples counseling and marriage counseling are her specialties. How long have you been searching for an effective relationship or marriage counselor? She offers relationship / marriage / couples counseling to couples and individuals in the suburban Boston area. Her office is located in Sherborn, MA, just south of Natick and Framingham. However, individual relationship counseling can take place on the phone in many instances.