Dillon "D-Boy" Masington, despite his age, has been training in BJJ, wrestling, submission grappling, Combat BJJ and MMA for more than 2 decades. During that time frame he has amassed a combat sports record which includes over 280 Wins in competition with 14l1 submissions in under 1 minute and with 119 of them by way of what has been described by several experts as "the best straight ankle lock in the world". Currently a BJJ black belt and a professional submission grappler, D-Boy is quickly becoming one of the best and most popular grapplers on the national circuit

Nick did not begin formal martial arts training until 1999, at the age of 35 after many years a sa competitive bodybuilder and power lifter. Currently a purple belt in BJJ, Nick has cornered over 125 MMA fights and over 600 grappling matches in the years since opening RPFS. He is our head children's instructor and runs our "Basics" grappling class. 

Sandra Masington began her marital arts training in the art of Tae Kwon Do under Grand Master Robert Newnow (10th Dan). She is a certified assistant martial arts instructor under Mater Nenow, currently holding the rank of Brown Belt. She is a 4 stripe Blue Belt in BJJ, trains kickboxing and is both the owner and President of RPFS and our Mat Rat's Instructor. Sandi's personality and instructing abilities make her a favorite with children and parents alike. 

Brian Hawk is one of the longest standing members at RPFS having joined the team way back in 2006! With extensive competitive  experience both on the mats and in the cage, Brian is currently a black belt in Brazilian Jiu Jitsu and has quickly become one of our more popular No Gi instructors.

Matthew "Big Red" Breiner is a professional MMA fighter who, before turning pro, boasted an amateur record of 5 - 1 which included 4 victories via devastating knock out. At 6' 1" tall and well over 200 lbs, Matt, who came to the world of MMA via college football, is not just a great fighter but an outstanding athlete. Known throughout PA for his striking abilities, Matt's physical prowess combined with his unique personal charm makes him a welcome addition to the RPFS striking staff. 

Matthew was a part of the RPFS family before being selected for Season 7 of the Ultimate Fighter reality TV show which launched what would end up being a 9 - 3 record in the UFC. One of the most naturally talented MMA fighters in the world Riddle is one of the only 2 men in history who fought every professional fight in his career in the UFC before parting ways with the promotion in 2013. Now professional wrestle who recently signed a 3 year deal with WWE, the "King of Bros" continues to stop[ in and run a class or two when he's back in the area. 

At long last we are honored to welcome Meredith to the RPFS staff! A true Rat Pack “O.G.”, few in this business have trained harder or longer than this gal! A BJJ blue belt with striking power and a skill set which puts most of the boys to shame, don’t miss your opportunity to train with one of the toughest ladies in the business. 

After a friendship of more thaan a decade, RPFS is pleased to announce that Marcus Hardeman has officially joined the team as an adjunct instructor. A standout in high school wrestling, Marcus flawlessly transitionied into the world of mixed martial arts where he has established a flawless record of 5-0 and garnering  two MMA titles in the process. However, as good as he is at fighting, Marcus is even better as a coach and will be running our MMA training sessions to help those interested in fighting to achieve their goals. 

RPFS is honored to have at the helm of our Muay Thai Kickboxing Program 4X World Muay Thai Champion Eric Utsch of Allentown, PA. As one of the top Muay Thai Competitors and trainers on the East Coast, Eric's striking and teaching skills are in a class be themselves. His classes, like the man himself, are tough, detailed and intense and are not from the feint of heart ,However, for those who endure, Eric's Muay Thai sessions at Rat Pack represent true MMA training at its best and we guarantee he will make you a better fighter! 

Scott Muniz is our assistant Gi Instructor and is the newest addition to the RPFS staff. A truly "home grown" grappler, all of Scott's training has been at RPFS where he has firmly established himself as one of our best BJJ players ever both in and out of the Gi. A Black Belt,  Scott has a true love for the more Traditional BJJ style, Scott was an obvious and appropriate choice to help run our Tuesday night classes which focus on Gi training. 

The newest addition to the RP staff, Nate Rex is a true “mixed martial artist” with a winning record in grappling, super fights and MMA. Known for his amazing conditioning and off the charts strength,  Nate’s potential is limitless both as a competitor and as an instructor.

Striking/grappling Instructor Luis Rodriguez first walked into RPFS over a decade ago, at the age of 30, with no prior training or fight experience. Within a few short years he dropped over 70 pounds and established a winning MMA record and garnered Rat Pack its 12th MMA title. Now a Brown Belt in BJJ and Black Belt in Karate, Luis enjoys nothing more than sharing his well-rounded skill set with the collective while helping other fighters achieve their dreams. 

A longtime friend of D-Boy, Luke Shiomos officially joined the RPFS team in 2025 as an adjunct instructor. A key member of the Wildcard Team which took the grappling world by storm by winning the Finisher's 2023 Quintet Tournament, Luke has established himself as one of the rising stars of the grappling world particularly in the Northeast. Currently a Black Belt in BJJ, his impeccable technique and attention to detail lends itself to great instruction and has made him a very valuable addition to the squad.