Executive Bios

The management team at Pediatric Therapeutic Services (PTS) combines significant pediatric physical therapy expertise with a diverse array of clinical and administrative experience.

Diana Fongheiser is co-owner and founder of Pediatric Therapeutic Services, Inc. With twenty years of business administration experience, her entrepreneurial expertise in the field of education management is well-established.
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Pamela Girvin Hackett, MPT is co-owner and founder of Pediatric Therapeutic Services, Inc. Her strong clinical background and experience as a school-based therapist helped her to identify opportunities for transforming the traditional model of school therapy in the region.
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Philip Puleo, M.S., CCC/SLP, is Executive Director of Pediatric Therapeutic Services, Inc. He brings considerable expertise in supporting other PTS directors and working with them to improve the service and experience of our districts and PTS therapy team. 
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Melissa Callahan-Whelan is the Managing Director of Pediatric Therapeutic Services’ expansion into New York and Connecticut.  Previously she served as the program manager for Saint Joseph’s Medical Center’s School – Based Therapy Program, and as a clinical manager of occupational and physical therapy services At TheraCare of NY. 
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Melissa Welsh is a graduate of the University of the Sciences in Philadelphia, Pennsylvania.  Since that time, she has worked with the pediatric population, providing treatment for children with Autism Spectrum Disorder, Downs Syndrome, Spinal Muscular Atrophy, Cerebral Palsy, Mobius Syndrome, Sensory Processing Disorder, and varying fine motor and visual motor integration deficits.
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Candice Donnelly-Knox, OTR/L is a Director of Clinical Services at Pediatric Therapeutic Services. Her career to-date has been dedicated to collaborating with professionals that provide high-quality therapeutic services to help children reach their fullest potential.
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Lesley Geyer, OTR/L has been an integral part of the Pediatric Therapeutic Services team for over five years, serving as Executive Director in Conshohocken, PA.  Recently she elected to transition to the role of Clinical Consultant for the organization, in order to have more flexibility in meeting the increasing needs of her family. 
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Dawn Marchini is Director of Operations for Pediatric Therapeutic Services, Inc., supervising corporate office staff and serving as the point person for the company’s administrative functions. 
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