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Meet Your Texas Professional Learning Team

Kasey Bratcher: Senior Vice President of Professional Learning

Kasey is a passionate leader striving to make a big impact on mathematics education across the country. She is an advocate for student thought and is driven to support educators as they create their own LONG + LIVE + MATH classrooms, full of communication, collaboration, creativity, and critical thinking. 

As Sr. Vice President of Professional Learning, Kasey is now living out her passion by leading the superb work of Carnegie Learning’s Professional Learning group in schools and districts across the US. 

Before joining Carnegie Learning full time in 2011, Kasey taught middle and high school mathematics for eight years and served as a Mathematics Consultant and coach for the largest Educational Cooperative in Kentucky.


Cassie Martin-Reynolds: Regional Vice President of Professional Learning

Cassie has been designing and facilitating impactful professional learning experiences at Carnegie Learning since 2007. She’s partnered with districts like Dallas ISD, Frisco ISD, Santa Fe, NM, and Richmond County, GA.

She’s also facilitated student-centered mathematics classrooms as a high school math teacher, department head, and math coach. As our Regional Vice President of Professional Learning, she serves as a thought partner, coach, and mentor for districts across the country as they implement Carnegie Learning Resources and Professional Learning services.

Cassie supports our Texas Team in a variety of ways - you might see her facilitating initial training workshops, engaging in data conversations, or demoing an upcoming lesson. Regardless of what she’s doing, we can guarantee that Cassie will be supporting you with a smile!

Peter Carellas: Senior Manager of School Partnerships

Peter has worked in education for over 20 years. Prior to joining Carnegie Learning, he served as VP of Professional Development at a Mathematics Educational Technology Company where he framed the professional development program and oversaw the Sales and Educational Services Team.  In the classroom, Peter has extensive experience in K-8 education and served as a Middle School Mathematics Coach for Albuquerque Public Schools.  Currently with Carnegie, he works in Texas and NM where he facilitates in-classroom as well as custom professional development for K-8 teachers.  Peter was named Carnegie Learning’s Professional Learning Person of the Year for 2019/2020.

Julie Moss: Manager of School Partnerships

Julie spent 12 years in Texas classrooms teaching bilingual 5th grade to high school geometry. She specializes in supporting at-risk students to excel in mathematics. Julie grew up in El Paso, Texas and earned her bachelors and master's degrees from New Mexico State University. Julie has spent the last 3.5 years as an instructional coach supporting Middle and High School teachers across Texas to realize the potential in their classrooms everyday. 

Aaron Houston: Manager of School Partnerships

Aaron joined the Carnegie Learning team in 2021. Prior to joining Carnegie Learning, Aaron worked as a high school Mathematics teacher and a Secondary Math Strategist in Grand Prairie ISD. He has nine years of classroom experience teaching Algebra 1, Geometry, Algebraic Reasoning, and Math Models. He also has three years of experience at the district level: coaching and supporting teachers in planning and in Professional Learning Communities, developing curriculum-based assessments, and delivering professional learning. Aaron currently lives in Mansfield, Texas with his wife and two daughters.

Wil Simpson: Manager of School Partnerships

Wil has devoted over 20 years of service in support of educators and students in Florida. Wil’s career started as a high school math teacher where he served on multiple school and district committees, spearheaded school-wide technology initiatives, and was recognized by his colleagues as Teacher of the Year. Afterwards, Wil worked in nonprofit management as an education advocate where he coordinated multiple services throughout local school districts. Prior to joining the Carnegie Learning team in 2021, Wil served as an online administrator for nine years where he supported Math and English teachers, earned his doctorate, and was recognized by the governor for deploying a fully online MTSS model.