Bessie Whitmore Stillman (1871-1947) was an educator and contributor to the Orton-Gillingham teaching method for students with disabilities in reading. (From Wikipedia)
More about Bessie W. Stillman: Associated author:Books by Bessie W. Stillman:
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Stillman, Bessie W. (Bessie Whitmore), 1871-1947: Remedial Training for Children with Specific Disability in Reading, Spelling and Penmanship (2 parts bound in 1 volume; New York: The authors, c1946), also by Anna Gillingham (page images at HathiTrust)
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