Sempai Mason is a Sandan, 3rd Degree black belt, and a student of Sensei Stan Wilbur.  She is the head assistant instructor and co-owner of the Southwest Harbor and Bar Harbor branches of Eastern Maine Karate.  She has over 13 years of experience instructing Shorin-Ryu Matsumura Seito and has also instructed women's self defense seminars and classes for the University of Maine as well as the Mount Desert Island YMCA in Bar Harbor.

Sempai Black is a Nidan, 2nd degree black belt, and a student of Sensei Nate Mason. She is the head instructor of the Blue Hill Peninsula Karate Dojo, and is also a senior assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  She has recently expanded classes to the Trenton area.  She has over 11 years experience instructing and training in Shorin-Ryu Matsumura Seito Karate, and has taught many self-defense seminars and workshops in the Blue Hill area.  She is currently teaching after school programs at three local area schools.

Sempai Huntley is a Nidan, 2nd degree black belt, and a student of Sensei Nate Mason.  He is the head instructor of the East Machias Karate Dojos, and is also an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  He has over 8 years experience instructing and training in Shorin-Ryu Matsumura Seito Karate.  Sempai Huntley currently owns and operates an auto body repair business in East Machias, Me.

Sempai Ouellette is a Nidan, 2nd degree black belt, and a student of Sensei Nate Mason.   He is the head instructor of the Harrington Dojo, and is also an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  He has over 9 years experience instructing and training in Shorin-Ryu Matsumura Seito Karate.

Sempai Hundhammer is a Shodan, 1st degree black belt, and a student of Sensei Nate Mason.  He is an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  He has over 9 years experience instructing and training in Shorin-Ryu Matsumura Seito.

Sempai Jediny is a Shodan, 1st degree black belt, and a student of Sensei Nate Mason.   She is an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.   She has over 10 years experience instructing and training in Shorin-Ryu Matsumura Seito and has assisted at many demonstrations and self-defense seminars.

Sempai Fuller is a Shodan, 1st degree black belt, and a student of Sensei Nate Mason.  He is an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  He has over 6 years experience instructing and training in Shorin-Ryu Matsumura Seito.  Sempai Fuller currently lives in Gardner, MA, and works for Massachusetts General Hospital.

Sempai Woodworth is a Shodan, 1st degree black belt, and a student of Sensei Nate Mason.  She currently teaches at the Trenton Dojo.  She is an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  She has over 6 years experience instructing and training in Shorin-Ryu Matsumura Seito.  Sempai Woodworth works for the Mount Desert Island Hospital.

Sempai Welsh is a Shodan, 1st degree black belt, and a student of Sensei Nate Mason.  He is an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  He has over 5 years experience instructing and training in Shorin-Ryu Matsumura Seito.  Sempai Welsh currently lives in Groton, NY, and works in the Genetics Dept. of Cornell University.

Sempai Reed is a Shodan, 1st degree black belt, and a student of Sensei Nate Mason.  He is an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  He has over 6 years experience instructing and training in Shorin-Ryu Matsumura Seito.  Sempai Reed currently works for Jackson Laboratory in Bar Harbor, Me.

Sempai Michaud is a Shodan, 1st degree black belt, and a student of Sensei Nate Mason.  He is an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  He has over 17 years experience instructing and training in the martial arts and 3 years in Shorin-Ryu Matsumura Seito.  Sempai Michaud is the head instructor of the Swans Island dojo, and is the Police Chief for the Swans Island Police Dept.  He made his first trip to Okinawa, Japan in March of 2007.

Sempai Brown is a Shodan, 1st degree black belt, and a student of Sensei Nate Mason.  She is an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  She has over 4 years experience instructing and training in Shorin-Ryu Matsumura Seito.  Sempai Brown works for the Bar Harbor School Dept.

Sempai Kuffler is a Shodan, 1st degree black belt, and a student of Sensei Nate Mason.  She is an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  She has over 6 years experience instructing and training in Shorin-Ryu Matsumura Seito.  Sempai Kuffler is a student of MDI High School and will be soon attending Smith College.

Sempai Brown is a Shodan, 1st degree black belt, and a student of Sensei Nate Mason.  He is an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  He has over 9 years experience instructing and training in Shorin-Ryu Matsumura Seito.  Sempai Brown is a student of MDI High School.

Sempai O'Brien is a Junior Nidan, 2nd degree black belt, and a student of Sensei Nate Mason.  He is  an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  He has over 9 years experience instructing and training in Shorin-Ryu Matsumura Seito Karate.  Sempai O'Brien is a student of MDI High School.

Sempai Ouellette is a Junior Nidan, 2nd degree black belt, and a student of Sensei Nate Mason.  He is an assistant instructor for the Southwest Harbor, Harrington, and Bar Harbor Dojos.  He has over 9 years experience instructing and training in Shorin-Ryu Matsumura Seito Karate.

Sempai Brown is a  Junior Shodan, 1st degree black belt, and a student of Sensei Nate Mason.  He is an assistant instructor for the Southwest Harbor and Bar Harbor Dojos.  He has over 5 years experience instructing and training in Shorin-Ryu Matsumura Seito.