Susan Gilleran

Susan Gilleran is an online mathematics educator based in Canton, Michigan, and the founder and instructor of AP Calculus Learning Center LLC. Her career began in the classroom as a high school math teacher at Grosse Pointe North High School, and it later moved into the corporate world, where she spent three decades at Ford Motor Company and rose to become an IT Technical Planning and Support Manager. After retiring from Ford, she returned to education, teaching online with PA Homeschoolers for many years before building her own independent program and subcontracting to schools.

Gilleran holds a Bachelor of Science in Mathematics and a secondary teaching certificate from Wayne State University, an MBA in Management and eCommerce from Lawrence Technological University, and a certificate in information systems from the Honeywell Institute of Information Sciences. She has also completed AP Summer Institute courses. Through the National Council of Teachers of Mathematics and the College Board community of teachers, she stays current with developments in her field. Her students achieve notable results on AP exams, with 70 to 80 percent earning a 5 and an average score of 4.4 to 4.5 in AP Calculus BC.

Guided by compassion and a belief that teaching is a calling, Gilleran blends rigorous instruction with personal attention, helping students understand why the mathematics works rather than simply memorizing procedures. She credits her bipolar disorder and ADHD with giving her distinctive strengths, and she encourages aspiring educators to embrace technology, including AI, and to keep learning. Outside of teaching, she enjoys journaling, drawing, and creating art, and she supports Save the Children, the ASPCA, and AARP.