The Story of SIS
Sandra Dillon, Author
In 1972, Sandra Dillon embarked on a mission to discover ways to provide more effective education for students with specific language disabilities. Inspired by the works of Dr. Samuel T. Orton and Anna Gillingham, Sandra's pursuit of answers led her to influential educators.
In developing SIS, Sandra Dillon integrated teaching methods learned directly from Patricia and Charles Lindamood, Beth Slingerland, and Aylett Royal Cox, the author of Alphabetic Phonics. Over 21 years, her collaboration with students and colleagues at the Albuquerque Public Schools' Language Clinic for dyslexic students played a pivotal role in shaping the SIS program.
Sounds In Syllables represents the culmination of Sandra Dillon's journey, influenced by the groundbreaking work of Orton, Gillingham, and other educators. Sandra's dedication to addressing the unique needs of dyslexic learners led to the creation of an approach designed to provide effective, personalized instruction.
Acquisition by ASDEC
In 2023, the Atlantic Seaboard Dyslexia Education Center (ASDEC) acquired SIS Publishing from Sandra Dillon. This acquisition ensures that current and future Academic Language Therapists will have secure access to the power of SIS for their students.
ASDEC is a 501(c)(3) non-profit training and advocacy center headquartered in Rockville, MD, dedicated to preventing academic failure through evidence-based multisensory reading and math instruction. Our founder, Claire Nissenbaum, F/AOGP. M.A., CAT established ASDEC in 2000 to help dyslexic children and adults overcome barriers to learning. Along with the clinical psychologist Betty Levinson, with whom she had partnered since 1974, Ms. Nissenbaum developed the only training center in the Washington, DC region that offers IMSLEC accredited, IDA endorsed evidence-based structured, multisensory techniques in language skills (decoding, fluency, spelling, writing, vocabulary, and comprehension) and math. Built on close to 50 years of Orton-Gillingham based training, ASDEC is recognized by educational psychologists, parents, school administrators and advocates as being the highest quality in the field of dyslexia and learning disabilities.