Staff Directory for River Crossing YMCA

Derek Stout is a personal trainer based in Fairless Hills with a background in Exercise Science from Temple University. He specializes in strength and conditioning, bringing his passion for football and pickleball into motivating clients to reach their fitness goals.

Certifications: 

NASM Certified Personal Trainer

Maria Sullivan serves as the WOW Center Director of Operations at the River Crossing YMCA, bringing dedication, warmth, and nearly two decades of service to the community.

Maria began her YMCA journey in 2008 in the Childcare Program as a part‑time teacher’s aide, occasionally supporting the babysitting program when needed. During these early years, she built strong, lasting connections with children and families—relationships that shaped her passion for service. In 2010, she transitioned into a full‑time Membership role, where her compassion for members, families, and the broader community continued to grow. She has always valued the meaningful conversations shared with members over the years.

When the Call Center launched in 2020, Maria joined the team as one of the first points of contact for members, guests, and prospective members. Whether answering phone calls or responding through webchat, she enjoyed helping people discover the wide variety of programs the YMCA offers for all ages.

In 2025, the Call Center was rebranded as the WOW Center, marking a new chapter of enhanced service and support. Maria embraced this evolution wholeheartedly. She finds it deeply rewarding to lead a team that efficiently delivers on member needs and requests, and she takes great pride in supporting all branches across the association.

Maria earned her Bachelor of Science in Hotel and Restaurant Management in the Philippines, a foundation that strengthened her commitment to hospitality and service. She is a proud mother of two young adult sons and a young daughter.

Maria is honored to be part of the River Crossing YMCA family—an organization that touches lives and makes a meaningful difference every day. 
 

Nicole Tanner serves the Doylestown community and brings an uplifting, supportive approach to fitness. As a Community Mentor for BollyX, the Bollywood inspired workout, she is passionate about helping individuals find joy and confidence in their workouts while building a strong sense of community.

Jim Tyrrell serves the Doylestown community and is a Certified Personal Trainer with a specialization in TRX for golf. As an active golfer, swimmer and cyclist, he brings real world experience into his training, helping clients improve strength, mobility and performance both in sport and everyday life.

Tami Unger joined the YMCA in 2016 as an Early Childhood Director and quickly expanded her leadership to include Camp, School-Age, and Food programs. She is passionate about building strong relationships with families and ensuring community needs are met through Y services. Now Branch Director at the Allentown Branch, Tami holds a degree in Early Childhood Education from East Stroudsburg University. She also serves as a Professional Development Specialist with the Council for Professional Recognition and volunteers with the Girl Scouts. Tami lives in Lehigh County with her husband, six children, three grandchildren, a dog, and a cat.

Candi Van Wagner serves the Doylestown community and has been an AFAA Certified Personal Trainer since 1997. She also holds certifications in mat Pilates, nutrition and senior health. As a three time cancer survivor, Candi brings a deeply personal and inspiring perspective to her work, helping clients build strength, resilience and confidence through every stage of their wellness journey.

Certifications: 

AFAA
AFA Senior Health Certified

Diana began her YMCA journey in 2017 with the Stay and Play program, building strong connections with families. Her passion for wellness led her to become a Zumba instructor, energizing participants and organizing events at the Nazareth branch. She later transitioned into the membership department, advancing to Membership Coordinator and deepening member engagement. Her leadership and dedication earned her the role of Director of Operations, where she further strengthened programs and initiatives. In 2025, Diana was appointed Branch Director of the Nazareth YMCA. She continues to lead with passion and purpose. Diana lives in Nazareth with her husband and son.

Marissa was a previous Upper Bucks YMCA gymnast for 6 years. She began her coaching career in 2015. She has a Occupational Therapy Assistant, with a specialty in Brain Injury Rehab. In addition to coaching, she works for a chiropractor part time.