Ezra Light Grumbine (February 1, 1845 - February 16, 1923) was an American medical doctor, local historian, and published columnist and poet in the Pennsylvania German language. His dialect pseudonym was "Wendell Kitzmiller," which he used to write weekly columns in the Lebanon News beginning on November 17, 1900.

Grumbine was born in Fredericksburg, Pennsylvania and died in Lebanon, Pennsylvania. He received his medical degree from the University of Pennsylvania and served as U.S. postmaster at Mt. Zion from 1877 to 1890.