Final answer:
Booker T. Washington was the educator who Mark Twain presided at the Tuskegee Institute Silver Anniversary Lecture in 1906.
Step-by-step explanation:
In 1906, Mark Twain presided at this educator's Tuskegee Institute Silver Anniversary Lecture:
The correct answer is Booker T. Washington.
Booker T. Washington was an African-American educator, orator, and statesman who founded the Tuskegee Normal and Industrial Institute in 1881. He believed that educational and business ownership were essential to the success and stability of the African-American community. Mark Twain presided at his Tuskegee Institute Silver Anniversary Lecture in 1906, further highlighting Washington's impact.