Daniel Belli | Owner
Strength and Conditioning Coach
Daniel Belli has owned and operated Mason Street Strength and Fitness since January 2016. He earned a Bachelor of Science in Exercise Science/Physical Education at Southern Connecticut State University, he is certified in Physical Education K-12 by the State of Connecticut. Daniel has taken his experience as a collegiate football player as well as a decade in the industry to help develop and implement programs for adults and youth athletes alike. His training approach encompasses the mind and the body to provide clients with a positive experience for achieving their fitness and lifestyle goals. Daniel has helped many high school student athletes elevate their performance to allow them the opportunity to be recruited for college sports.
In addition to working with clients directly, Daniel has also held management positions, both as a Fitness Training Manager and Personal Training Director, in fitness clubs throughout Connecticut and New York. He has also coached high school football as well as directed and implemented their strength and conditioning programs.
Additional Certifications: Certified Physical Preparation Specialist (CPPS), FMS Level 1 & 2, CPR, First Aid & AED.
Kyle Marandino | Coach
Strength and Conditioning
Kyle is a Certified Strength and Conditioning Specialist (CSCS) through the NSCA. In addition, he is a Registered Strength and Conditioning Coach (RSCC), an elite certification that distinguishes individuals who have substantial experience as a strength and conditioning coach in the professional or collegiate setting.
Prior to joining Mason Street Strength, Kyle was a Strength and Conditioning Coach within the Boston Red Sox organization where he assisted in the design and implementation of the strength and conditioning program for both major league and minor league players. Earlier Kyle worked as a Football Strength and Conditioning Intern at the University of South Carolina where he assisted in all aspects of the Gamecock football strength and conditioning program as well as with track and field.Kyle has also worked with male and female athletes from a wide variety of Division 1 sports at the University of Connecticut, Quinnipiac University, and in the high school setting.
Kyle graduated from Springfield College with a BS in Applied Exercise Science.
Keith Kirwan | Coach
Strength and Conditioning
Keith Kirwan’s training begins with a plan tailored for each client. Keith brings together movement, posture, proper mechanics, injury prevention, and strength for a comprehensive, total body approach. There is no one way to be strong, so whether your goal is ligament/tendon strength, cardiovascular strength, muscular strength, postural strength, or explosive speed, Keith has a plan. It’s all about training harder and smarter to achieve success.Keith’s journey into the field of physical preparation began early. He discovered that natural athleticism wasn’t enough to stand out; to shine requires physical preparation and training. And the results quickly showed: he made tremendous improvements on the football field and in track and field. Today, Keith uses his trainer education and first-hand experience to excel as a coach, to inspire and guide others.Keith is a certified NASM Certified Personal Trainer and a CPPS Certified Physical Preparation Specialist.
Brett Parsell | Coach
Strength and Conditioning
Brett received his BS in Exercise Science from Central Connecticut State University. Prior to that he was a two sport athlete at Becker college, where he played football and lacrosse. Brett's most recent experience was that of a sports performance coach at Velocity Sports and Parisi Speed school in Westchester, NY. With over 5 years of experience in the field Brett has worked with countless athletes and many high schools and AAU programs in Fairfield and Westchester Counties. Brett is a Certified Exercise Physiologist through the American College of Sports Medicine and is CPR/ AED certified through the American Red Cross.
"After receiving several offers from facilities in Greenwich and Rye, I ultimately chose Mason Street Strength & Fitness because of the atmosphere and the coaches," Brett explains. "As soon as you walk down the stairs you know it’s time for business! As their coach, clients can expect a FUN but tough workout. I’m most looking forward to adding even more value to a facility that has helped so many reach their maximum potential, adults and young athletes alike."
Ricky Mejia | Coach
Strength and Conditioning
Ricky received his Bachelor’s in Exercise Science with a concentration in human performance from Southern Connecticut State University in 2019. Prior to college he was a 3 sport athlete and captain for Norwalk High School. His athletic upbringing made a seamless transition to learn more about athletic performance and the human body. Before joining the team here at Mason St. Strength & Fitness he was a trainer at a physical therapist clinic specializing in therapeutic exercises and injury prevention starting his senior year in high school back in 2015. Soon after graduating from SCSU he received his exercise Physiologist certitication (EP-C) through the top exercise science organization, American College of Sports Medicine (ACSM), specializing in exercise prescription for all populations. Ricky also received his basic life support CPR/AED Certification through the American Red Cross“I am ecstatic to be a part of the team of coaches here at Mason St. Strength & Fitness. The facility is extraordinary. it has evervthing vou need to be vour best and more. Anvone from athletes to the weekend warrior can strive here in a positive environment with coaches that truly want you to succeed."
Zachary Onufrik | Coach
Strength and Conditioning
Zach is a passionate and knowledgeable strength and conditioning coach with both his bachelors and masters degrees in Exercise Science from Sacred Heart University. He is a Certified Strength and Conditioning Specialist.(CSCS) Zach worked in the rehabilitation setting as a Physical Therapy Technician for 3 years with a variety of different patients ranging from athletes to the elderly. During his graduate program he completed two internships with the Sacred Heart University and the Marist College Strength and Conditioning Departments. During this time he honed his skills of programming and coaching various types of division 1 student athletes.
“I decided to work at Mason Street Strength and Fitness because of the professionalism and positive culture that the facility exudes. I am excited to be part of this team of great coaches and look forward to providing high quality training to the community.”
Gabe Mounkhall | Coach
Gabe is an NSCA Certified Strength and Conditioning Specialist (C.S.C.S.) with extensive experience in physical training. While attending SUNY-Plattsburgh in pursuit of his undergraduate degree he played baseball and developed a passion for fitness in the process of trying to maximize his potential on the baseball field.
He began training and programming for friends and teammates while at school. After college he started training at a facility and fell in love with the process of enhancing the physical health of others. He is now pursuing his Master’s in Exercise Science at Queens College. Gabe synthesizes the lessons he has learned during his athletic, academic, and training career to best help clients achieve their fitness goals.
Gabe is most looking forward to the opportunity to train hard working clients with all kinds of different life experiences and fitness goals. While doing so alongside the knowledgeable and professional Mason Street Strength and Fitness Coaching staff. He is eager to help improve the fitness and ultimately the lives of all those who walk through Mason Street’s doors. Gabe is looking forward to train amongst and learn from some of the most knowledgeable strength coaches in the industry.
Jake Hios | Coach
Jake graduated from UMass Amherst with a B.S. in Kinesiology. As a 3 sport athlete in high school, he saw how much his hard work on strength and conditioning helped his performance on and off the field. Thus fueling his desire to help others on their own sports journey.Jake works with a broad range of clients and populations, and is particularly passionate about working with young athletes. He knows how to keep this age group engaged by creating fun and effective workouts that instill a love for training, while helping them become the best they can be at their particular sport. Jake has coached high school athletes from a wide variety of sports including baseball, lacrosse, soccer and rowing. His focus is on improving performance and recovery in order to prepare athletes for higher levels of competition.Jake has also assisted many adults in achieving strength and building confidence in the gym. He has an amazing ability to connect and communicate with others, as well as an easygoing and positive attitude, making him a great fit for all ages and abilities.“I chose to peruse a career at Mason Street Strength and Fitness because of the sense of community right when I walked in. All of the great coaches dedicate themselves to providing quality training that is engaging and helps clients reach their goals.”
Julianna Fauci | Coach
Julianna is a strength coach with a B.S. in Kinesiology from the University of Alabama. For the past two years she has worked closely with high-level athletes, combining performance training with injury prevention and post-operative rehabilitation to help them move, feel, and perform at their best.
Julianna’s coaching approach is rooted in integrated performance training combining strength and conditioning, mobility work, injury prevention, and rehabilitation into a seamless, individualized program. Her training style addresses the entire kinetic chain and the interplay between different muscle groups and movement patterns. She aims to develop all fundamental physical qualities simultaneously, rather than focusing on just one, such as strength or endurance.
Drawing from her own athletic background as a competitive softball player and a transformative journey through major back surgery, she brings a deeply personal perspective to my work. Her coaching philosophy centers around pain-free movement, functionality, and long-term physical resilience. She is passionate about helping adolescents, athletes and older adults move better, recover smarter, and perform at their highest level—without compromising their bodies in the process.
Kate Stahl | Coach
As a marathoner turned certified personal trainer, Kate is passionate about helping women feel strong, capable, and confident—whether they’re training for a race or navigating motherhood. At Mason Street Strength and Fitness she is proud to offer personalized training in a supportive, well-equipped facility where every client is met with a plan that fits their unique journey.
Kate is pre- and postnatal certified and work closely with women through all stages of pregnancy and postpartum recovery, including addressing diastasis recti and prolapse. Whether you’re rebuilding strength, boosting energy, or simply carving out time for yourself, she will guide you with a mix of strength, functional movement, and corrective exercise to help you feel your best—inside and out.
Chris Cledera | Coach
Strength and Conditioning
Chris brings a personalized approach to every client’s training journey. With a focus on movement efficiency, strength, and injury prevention, Chris designs programs that address the unique needs and goals of each individual. Understanding that strength comes in many forms—whether it's muscular endurance, postural stability, or dynamic power—Chris tailors each plan to enhance overall performance and well-being.
With a BS in Exercise Science from Southern Connecticut State University and a background as a collegiate track athlete, Chris combines academic knowledge with firsthand athletic experience. This blend of education and practical insight, including experience working in a physical therapy clinic, allows Chris to craft effective training programs that are both science-based and results-driven.
Chris leverages his expertise in biomechanics, strength coaching, and Postural Restoration Institute (PRI) principles to guide clients toward their fitness goals. Whether you're aiming to improve athletic performance, recover from an injury, or simply achieve a healthier lifestyle, Chris is committed to helping you succeed through smarter, more effective training.
Drawn to Mason St. Strength & Fitness by the gym's dedication to excellence and supportive community, Chris found an ideal environment to share his passion for fitness. Aligning perfectly with the gym's philosophy, Chris is excited to help clients achieve their full potential.
Jamie Mazzotta | Coach
Strength and Conditioning
Jamie has over 30 years of personal training experience with the Greenwich community. He is certified through NFPT and ACE as well as a licensed massage therapist. His clientele typically includes an older population focusing on stretching, mobility and basic strength work.When he is not working on a client at Mason St you can find him on a paddle board in Montauk.
MASON STREET
STRENGTH & FITNESS
67 Mason St, Greenwich, CT 06830
p: (203) 489-3732
e: FrontDesk@MasonStStrength.com
