What is the name of the teacher of "If you give me three days of light"?

In "If Give Me Three Days of Light", Helen's teacher is Anne Sullivan, because Anne Sullivan gave Helen selfless love and care, which helped her overcome the difficulties in life and realize her self-growth. Helen expressed her gratitude to Sullivan in the book, calling her "the grace of remodeling". Anne Sullivan's educational methods have also made Helen make great progress in her studies and become a talented, moral and caring person. Therefore, Anne Sullivan became the most important teacher in Helen's life.