Our Staff

Alexandra Manwarren

Executive Director

Alexandra Manwarren or “Alex,” is the Executive Director for Pegasus. Alex grew up riding and competing in horse shows across the U.S. She has vast experience teaching in both therapeutic as well as traditional riding programs.  A former director for the YMCA, Alex has experience with non-profit program management, fundraising, staff development, camps, and counseling. Alex is responsible for the daily operations of our facilities and programs as well as managing our website and social media profiles. She holds a B.S. in Psychology from Sweet Briar College, is an ANRC rated rider and a PATH certified instructor. To contact Alex, please email her: Alexandra@PegasusPhilly.org

Teresa Doherty

Program and Equine Director

Leading our Pegasus TRA program is Teresa Doherty. Teresa holds dual degrees in equine science and psychology from Rocky Mountain College. Innovative with our programs and passionate about our riders, Teresa has expanded and implemented many new programs and initiatives for Pegasus TRA. She works tirelessly to ensure our horses are healthy and happy in our lesson program.  In addition to teaching, leading community programs and overseeing a growing horse show team, Teresa has co-authored the Pegasus Equine Strategic Plan at Pegasus that she will be presenting at the 2019 PATH International Conference in November. Teresa holds a PATH therapeutic riding instructor certification, a PATH certification for Equine Specialist in Mental Health and Learning, and is a PATH International Mentor. She is also an adjunct professor at Delaware Valley University. To contact Teresa please email her:  Teresa@PegasusPhilly.org

Emily Wilmot

Assistant Program Director, Instructor

Emily has been riding and showing in Massachusetts where she gained valuable experience working as a barn manager and instructor for several boarding, lesson, and therapeutic riding programs. While attending Delaware Valley University, she competed on both the hunt seat and western IHSA teams earning National and Regional Championships.  Emily has a broad range of riding experience and a strong caliber of competition background. She graduated with a Bachelor of Science in Equine Business and Management and is currently pursuing her Masters in Education. She is also a Coaching Assistant, responsible for recruiting and helping with IHSA teams at Delaware Valley University. While at Pegasus, Emily enjoys riding Sergio and spending time with barn family! Emily is a PATH certified instructor.

Elysia Rodriguez

Volunteer Coordinator and Assistant Instructor

Elysia is our Volunteer Coordinator for Pegasus TRA, as well as being an assistant instructor. Elysia knows in depth about all our programs, riders, and horses, proving herself vital to the daily operations of our therapeutic programs! Elysia got her start at Pegasus TRA with a high school internship, which resulted in her receipt of the 2017 Jr. Volunteer of the Year at Pegasus TRA.  A graduate of El Centro High School, Elysia is currently attending Community College of Philadelphia and will be pursuing a career in nursing. To contact Elysia, please email her:  VolunteerCoordinator@PegasusPhilly.org

Ryan Frech

Instructor, Barn Manager, and Summer Program Director

Ryan joined Pegasus as a volunteer and quickly developed a passion for horses and our Pegasus community. He is a former Pegasus volunteer of the year, a graduate of Archbishop Ryan, and is currently attending Delaware Valley University to pursue an equine management degree where he also competes on the dressage team. Ryan knows the inner workings of our facility, programs, and horses. He also helps represent our program during outings, volunteer work days, and community events. His easy-going manner during lessons allows for riders to quickly develop a trusting relationship and a lasting friendship. Ryan is the summer program director and is a PATH Certified Instructor. To contact Ryan, please email him: Ryan@PegasusPhilly.org 

Olivia Slocum


Olivia grew up riding in Cape May County, NJ and has shown horses competitively from a young age. She has competed in top horse shows up and down the East Coast with many notable trainers and barns. Olivia graduated from Sweet Briar College with a degree in Psychology, where she was a member of the ANRC and ODAC teams. In 2014 she helped pilot SBC’s ANRC team to a national title, capturing the ANRC Novice Championship. When not teaching at Pegasus, Olivia rides professionally and can be found on her days off hanging out with her retired show gelding, Picasso. Pegasus is honored to have such an accomplished equestrian as part of our instructional team.  Olivia is a PATH certified instructor.

Sara Hertzel


Sara is a graduate of Temple University, where she served as Social Chair and Vice President of Temple University’s Equestrian Club (TUEC). She is currently working towards her Doctorate in Clinical Psychology at Widener University; she expects to graduate in the Spring of 2022. Sara brings a wealth of resources to Pegasus with her background in mental health, cognitive-behavioral therapy, and interdisciplinary care. She has clinical experience with evidence-based treatment for substance use disorders, anxiety, depression and trauma. Sara’s training in neuropsychological assessment among those with brain injury, ADHD, learning disorders, and Autism ensure that Pegasus is current with psychological theory and practice.  Sara is an experienced equestrian with a lifetime of riding and competing in the hunter/jumper ring. Sara is a PATH certified instructor. 

Taylor Adams

Equine Trainer, Instructor

Taylor Adams is a graduate of Delaware Valley University with a Bachelors of Science degree in Equine Instruction and Training as well as a Masters of Education degree in Teaching and Learning . Taylor has completed the British Horse Society certifications through Stage 3. Taylor works in the Equine Department as an Administrative Assistant as well as adjunct faculty for DVU. Taylor is the co-author of the Pegasus TRA Equine Succession Plan that she will be presenting at the PATH International Conference in November 2019. While at Pegasus, Taylor enjoys catching up on all of the horses latest accomplishments both individually and with their riders! Her work as our Equine Trainer ensures that Pegasus TRA has happy and safe horses. Taylor is a PATH Certified Instructor.

Casondra Kennedy


Sondra attends Delaware Valley University where she is pursuing her degree in counseling psychology with a minor in equine instruction and training. She has ridden since the age of 8 and is an accomplished rider. With her volunteer experience and shadowing at several other east coast therapeutic riding programs, she brings wonderful new ideas to contribute to our program.  When not teaching at Pegasus, Sondra enjoys riding and participating in shows with her horse. Sondra is a PATH certified instructor.

Haley Flagg


Haley joins our Pegasus staff with a diverse equestrian background. She has grown up riding and showing in the New York state show circuit and spent time as a Vet Assistant. She has gained expertise working with horses in all capacities as an Equine Assistant at a top ranked show barn for over 6 years. A graduate of Drew University she was captain of her Inter-Collegiate Equestrian team and holds her degree in Environmental Science. Haley’s enthusiasm for horses and the interest she takes in her riders is evident to all that meet her.  Haley is a certified PATH instructor.

Corey Woldenberg, DPT

Physical Therapist

Corey Woldenberg is a licensed physical therapist. Her experience volunteering with therapeutic riding programs first inspired her to enter the profession of physical therapy. She has served as a volunteer with therapeutic riding programs for 15 years across several states, and she is thrilled to share her skills with Pegasus. Looking ahead, she plans on pursuing her hippotherapy certification.

Barbara Wertheimer

Executive Director, Emeritis

Effective June 30, 2019 Barbara Wertheimer has retired from Pegasus TRA. She will be continuing her support of Pegasus overseeing grant writing and serving on various advisory committees. Barbara is a retired attorney who first came to Pegasus in 1991 when her daughter began riding in the program. Over the years she became an active volunteer in many facets of the organization, ultimately becoming President of the Board of Directors in 1997. She continued in that role until April 2007, when she assumed the position of Executive Director following the passing of the founder and former Executive Director of the program, Carol Tatum. Barbara and her family have embraced Pegasus and all that the program has done for countless individuals. She is thoroughly committed to its continued existence as the premier therapeutic riding program in Philadelphia.  

To contact Barbara, please email her: Barbara@PegasusPhilly.org

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