Meet Our Team
The Learning Spectrum is fortunate to have a group of talented, caring and dedicated individuals providing exceptional service to the students at The Learning Spectrum. Learn more about our responsibilities and backgrounds by reading the bios below.
In Loving Memory
Susan Mosure, Director of Finance (1976 – 2017)
Liz Greve, Director of Inclusion Services (1975-2022)
Our Directors
Samantha Angelas, MSC, Regional Vice President of Operations
Samantha has worked with the Autism community for over 10 years. She has a Bachelor’s degree in Behavior Psychology and a Master’s degree in School Counseling. Samantha has served as an independent provider for families using her skills in ABA to work on educational as well as community based skills. In addition, she worked in the local school district serving students in an inclusion classroom, and used counseling strategies with both students on the spectrum as well as typical, and parents in a situations that arise throughout life. She also has worked with behavior plans to assess and modify any situation to help benefit the child and the classroom. She has been actively participating in Positive Behavior Support System, and continuously implementing these ideas into practice. Samantha regularly attends ABA, Autism Spectrum Disorder, and counseling conferences to incorporate a variety of ideas into the students and staff as a whole. She has worked with several small teams to tackle specific targeted behaviors, as well as, assessed what needs are to be met to better the child’s and families experiences. Samantha is the mother to twin boys Georgios and Elias as well as Xander her oldest.
Stephanie Crawford – Director of Inclusion and Outreach
Stephanie Crawford is the Director of Inclusion Services at The Learning Spectrum. She was born and raised in Columbus, Ohio and is a graduate from The Ohio State University with a bachelor’s degree in Speech and Hearing Science. She is currently working towards obtaining her Intervention License and has worked in special education for 14 years, having joined The Learning Spectrum in 2016. In her free time she loves to read and spend time with her husband Tom, and two daughters, Willow, and Heidi.
Elizabeth Fonzi, M.A. CCC-SLP – Director of Clinical Therapies
Liz has been practicing speech-language therapy for 14 years. She is a licensed speech-language pathologist with the Ohio Board of Speech Language Pathology and maintains her Certificate of Clinical Competence with the American Speech and Hearing Association. Liz received her undergraduate degree in Communication Sciences from Ohio University and her Master’s degree in Speech Language Pathology from the University of Cincinnati. Liz has been working at TLS Central since April 2018. Prior to working at TLS, Liz worked as a speech therapist in an outpatient and acute care hospital setting where she worked with both adults and pediatrics for a variety of communication deficits. She has also had experience working in home health and in a school resource classroom for children with disabilities. Liz has received training and certification in LAMP (Language Acquisition Through Motor Planning), PECS (Picture Exchange Communication System), and Beckman Oral Motor. In 2022, Liz took on her role as Clinical Therapy Supervisor at The Learning Spectrum, and transitioned to Director of Clinical Services in 2024.
614-844-5433 (Option 1)
Natalie Lindsay – Director of Education – North East
Natalie has worked in the education field for fifteen years. She has a Bachelor’s degree in Human Services and Child and Family Studies from Ohio University. Natalie’s passion is working with families and students with disabilities as well as at-risk youth. Prior to working at TLS, Natalie has provided home-based intervention as an independent provider, assisted children and families in private as well as public schools and has taught students from preschool through high school in the classroom. As a Family and Student Coordinator, she worked closely with administration and school counselors to assist families while serving on intervention teams. During her time at TLS, Natalie has taught kindergarten at our Johnstown location and now serves as the Education and Behavior Advisor. She is married to her husband of fifteen years and together they have three children ages 11, 7, and 5.
Mary Berkey, MA, BCBA, COBA – Director of Staff and Family Development – North East
Mary Berkey is the Director of Staff and Family Development at The Learning Spectrum – North East. She graduated from Bethel University with a Bachelor’s degree in psychology, and obtained her Master’s degree in applied behavior analysis from Ball State University. She is also a Board Certified Behavior Analyst (BCBA) and a Certified Ohio Behavior Analyst (COBA). Mary began working at The Learning Spectrum in 2018 and has held a variety of positions within the ABA department before becoming a Director. In her free time, Mary enjoys spending time hiking, vacationing at the beach, and spending time with her loved ones including her husband, Nick and her three fur babies.
Allyson Ferrin – Director of Education – Central
Trevor Stewart – Director of Staff and Family Development – Central
Trevor holds a Bachelor’s degree in Business Administration from Franklin University. Since 2015, he has worked at The Learning Spectrum, first in the inclusion department then as a behavior float at the Central location. As of 2023, Trevor assumed the role of Director of Staff and Family Development. In addition to being a Registered Behavior Technician (RBT), he is also a Crisis Prevention Intervention (CPI) instructor. As part of his leadership development, Trevor also completed the TLS Leader Development Program in 2022-2023. In his free time, Trevor spends time with his wife and three kids and coaches boys soccer at Olentangy Berlin.
Sarah Johnson – MOT, OTR/L – Director of Education – South
Sarah is a board certified and state licensed occupational therapist. Sarah graduated from the Ohio State University with a bachelors of science in biology and went on to attend Chatham University, receiving her master of occupational therapy degree. Before joining the TLS therapy team in 2015, she gained experience working as an ABA therapist with children of various ages. Sarah has received training in the Handwriting Without Tears program and has attended state and national occupational therapy conferences, specifically the American Occupational Therapy Association’s Specialty Conference regarding OT’s distinct value in autism research and practice. Sarah is passionate about challenging each child to reach their full potential daily and strives to celebrate each child’s unique successes.
Brad Tarbutton , M.A.- Director of Staff and Family Development – South
Brad has worked with adults and children with disabilities in a myriad of roles over the past decade. He has experience in clinical, educational, and home-based settings. He has a Master’s degree in Applied Behavior Analysis from Ball State University. Brad completed his undergraduate work in Sociology/Anthropology with a Classics minor at Gustavus Adolphus College in Minnesota. He has also spent the last few years coaching high school ice hockey and lacrosse. In his free time Brad enjoys reading, hiking, traveling, and spending time with his wonderful family.