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 created an Equine Strategic Plan at Pegasus TRA that she has shared at regional PATH conferences and will be speaking at the PATH International Conference November 2019. 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. To contact Teresa please email her:  Teresa@PegasusPhilly.org

Emily Wilmot

Assistant Program Director, Instructor

Emily grew up 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.  We are excited to have Emily teaching at Pegasus with her broad range of riding experience and caliber of competition. 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. Emily is a PATH certified instructor.

Elysia Rodriguez

Volunteer Coordinator and Assistant Instructor

Elysia is our Volunteer Coordinator for Pegasus. You’ll know her as she is in every daily picture of the Pegasus volunteer appreciation week! She knows our programs, riders and the best way to integrate our volunteers into the Pegasus way of life. Elysia is also vital to our program as she is also a barn assistant helping to take care of our horses. Elysia got her start at Pegasus with a high school internship, was the 2017 Jr. Volunteer of the Year at Pegasus and she continues to be an integral part of our Pegasus team.  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. Ryan knows the inner workings of our facility, programs, and horses making him an excellent choice to 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 the prestigious Marshall & Sterling league, qualified for the Ariat adult medal finals and competed in horse shows across the country. 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 and currently working towards a Doctoral degree in Clinical Psychology at Widener University. She brings her background of cognitive behavioral therapy alongside a lifetime of riding, competing and teaching in the equestrian community. Sara’s hobbies include painting and hot yoga when she’s not in classes or teaching at Pegasus. Sara is a PATH certified instructor.

Taylor Adams

Equine Trainer, Instructor

Taylor Adams is an accomplished horsewoman who has been riding most of her life. She is a graduate of Delaware Valley University where she completed her Bachelors of Science degree in Equine Instruction and Training as well as the British Horse Society certifications through Stage 3. She is currently working through her Masters of Education degree in Teaching and Learning. Taylor also works at DelVal where she is the Equine Administrative Assistant and serves as adjunct faculty. Her work as our Equine Trainer ensures that we have 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 experience volunteering, as well as shadowing at several other east coast therapeutic riding programs, she brings wonderful new ideas to contribute to our program.  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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