Orton-Gillingham Approach Timeline: Evidence-Based, Enduring Success
Early 1900s Foundations
1900s–1920s: Dr. Samuel Torrey Orton, a neurologist and pathologist, studies children with unexplained reading difficulties.
He identifies a group of bright students who struggle with reading and spelling, which he referred to as “word blindness.”This is now known as dyslexia.
Orton concludes that reading difficulties stem from differences in brain organization, and that instruction must be explicit, structured, and multisensory.
1920s–1930s Collaboration with Anna Gillingham
Anna Gillingham, a psychologist, linguist, and educator, begins working with Orton to design a systematic teaching method.
Together, they develop a step-by-step, multisensory approach to teach phonics, spelling, and reading.
This becomes the Orton–Gillingham (OG) approach, the first method designed specifically for students with dyslexia.
1936 Publication of The Gillingham Manual
Gillingham and Bessie Stillman publish the first edition of Remedial Training for Children with Specific Disability in Reading, Spelling, and Penmanship, commonly called The Gillingham Manual.
The manual outlines the OG method, emphasizing phonemic awareness, sequential phonics instruction, and multisensory learning.
This becomes the blueprint for structured literacy instruction.
1940s–1960s Teacher Training and Expansion
OG is used to train teachers and tutors across the U.S., especially in special education and private tutoring.
Gillingham and her trainees establish teacher training centers, ensuring the approach spreads and maintains fidelity.
The approach becomes well known among reading specialists and speech-language pathologists.
1970s–1990s Adaptations and Programs
Educators and researchers develop specialized programs based on OG principles, making them more accessible for schools and clinicians.
These programs extend OG to group instruction and curriculum models while retaining its core philosophy.
1995: The Orton-Gillingham Academy was established to promote effective teaching methods for individuals with dyslexia.
2000s Evidence-Based Reading and the “Science of Reading”
Cognitive neuroscience confirms that explicit, phonics-based instruction works best for dyslexic learners.
Orton–Gillingham is recognized as a research-aligned, evidence-based approach.
The International Dyslexia Association (IDA) formally endorses OG principles as part of structured literacy, a broader educational movement emphasizing systematic and explicit teaching of language structure.
2010s–Present Structured Literacy Movement
“Structured literacy” becomes the modern umbrella term encompassing all programs based on a systematic, sequential and explicit reading instruction.
OG principles form the foundation of the science of reading, supported by decades of brain imaging, linguistics, and educational research.
Many states now mandate structured literacy training for teachers to address dyslexia and reading challenges.
