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Meet The Doctors

John E. DeFinnis, D.D.S.

Founder of Berwick Dental Arts


Dr. DeFinnis, the founder of Berwick Dental Arts, opened a general dentistry practice in October of 1970. Dr. DeFinnis earned a BA in 1964 and DDS in 1968 from Temple University. He graduated from Berwick Area High School in 1960. He also served 2 years in the US Army Dental Corps. Dr. DeFinnis is a current member and officer of many local boards, clubs and associations, and was presented the Distinguished Citizen Award in 1999. He currently serves on the PA State Board of Dentistry.

Bryan P. Carlin, D.D.S.


Dr. Bryan Carlin has been with Berwick Dental Arts since his graduation from Temple Dental School in 1984. Prior to that he graduated from the University of Notre Dame in 1980. A longtime resident of Berwick, he attended Berwick High School where he met his wife Roberta who is a retired Physical Education teacher who worked for 32 years in the Berwick School District on the high school and elementary levels. 

Dr. Carlin has been active in the community in a variety of organizations, including the United Way Board, the Kiwanis Club, the vestry board of the Episcopal Church, and was elected to serve two terms on the Berwick School Board.

He has three grown daughters, the youngest of whom is currently in dental school in Belfast, Northern Ireland.


Susan E. Ermish, D.M.D.


Dr. Ermish, a native of Berwick, joined Berwick Dental Arts in November of 2001. Dr. Ermish graduated from Berwick High School in 1988 and completed her undergraduate and dental studies at Temple University in 1995. Following graduation from Dental School, Dr. Ermish served for 6 years as a Dental Officer in the United States Navy. During her naval career, she was stationed for one year at King’s Bay Naval Submarine Base, and next five years at Marine Corps Base Camp Lejuene, NC. While stationed at Camp Lejeune, Dr. Ermish was deployed overseas with the 22nd Marine Expeditionary Unit onboard the USS Bataan, which participated in both military and humanitarian operations in Kosovo, Egypt, Israel, and Jordan. Dr. Ermish now resides in Berwick with her husband, Todd Gunther, who teaches at Berwick Area Senior High School. During her spare time, Dr. Ermish enjoys fishing, watching Nascar racing, and spending time with her two cats, Smokey and Sonny, and her 3 bearded dragons, Rusty, Ryan, and Kurt.Dr. Ermish is a member of the Pa. Dental Association and American Dental Association.

Nathaniel Flook, D.M.D.


Dr. Flook graduated locally from Berwick Area High School in 1996. He graduated from the University of Scranton in 2000 and from Temple University School of Dentistry in 2004. Dr. Flook worked at the Dental Health Clinic here in Berwick from 2004-2005.  He is a member of the American Dental Association, the Academy of General Dentistry, the Pennsylvania Dental Association, the Third District Dental Society, and the Luzerne County Dental Society. Dr. Flook is Invasalign Certified.