Our Experienced Team

Joe Walter

President & Teacher

Joe completed a BSBA – Bachelors of Science in Business Administration with a specialization in Marketing from The Ohio State University. During that time he also studied Molecular Biology. For further educational development and licensing, Joe attended Notre Dame college for graduate school, completing their TEEL program with a focus on Mathematics and Education.

Joe has been working with students since 2002. Originally a junior high and high school math teacher, he has since specialized by working with students in both K-12 and college in the following areas: Subject Area Tutoring (Math, Physics, Chemistry, Biology, English/Language Arts, Economics, and History), AP Test Prep, ACT/SAT Test Prep, GRE Test Prep, College Application and Essay Guidance, College Scholarship Application Assistance, Dyslexia & Learning Challenges Services.

Joe’s students have achieved 42 perfect ACT scores and 8 perfect SAT scores during his time with Sentryl Academy.

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Emma Carson

Teacher, College Admissions Advisor

Emma graduated from Miami of Ohio with a degree in Education and completed her Masters in Education at the University of Pittsburgh. She has specialized in working with at-risk high school students in her work as a counselor and as a college admissions advisory with Sentryl Academy since 2020. She has worked with students that have: Autism, ADHD, Down Syndrome, Dyslexia, Dyscalculia, Emotional Disturbance, Reading and Learning Disabilities, and Intellectual disabilities.

Emma has been working with these populations since 2013.  

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Calvin Sanders


Calvin graduated in 2009 from Xavier University in Cincinnati, Ohio with an undergraduate degree in History. He then completed his Masters of Education at the University of Dayton. Calvin’s specializations are History, Government, and Economics, working primarily with students from grades 8 through 12. Calvin has been a classroom teacher since 2016 and has worked as a tutor with Sentryl Academy since 2021, helping students nationwide.

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Isabel Morales


Isabel graduated summa cum laude from the University of Houston with an double major in Spanish and Education. She then completed her masters program at UH, and graduated in 2019. She has been an in-classroom Spanish teacher for the past 4 years and has been with Sentryl Academy since early 2023. Isabel works with high school and college students nationwide.

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Terry Phillips


Terry graduated from the University of Kansas with a degree in Mathematics. In 1991 he began teaching high school Mathematics and completed his Masters program over the next few years. Terry has taught as a classroom teacher in Kansas, Oklahoma, and Texas for over 30 years. He has been with Sentryl Academy as a teacher and SAT/ACT test preparer since 2023.