He designed fixed and removable inclined planes to correct Angle Class II malocclusions.
During his childhood, he migrated to states such as Vermont and Pennsylvania in order for his father to find a job, ultimately returning to upstate New York.
At age 20 his uncle, Albigence W. Kingsley, who was a dental physician in Elizabeth, NJ introduced him to dentistry.
He published a report of the case of a child with a V-shaped alveolar arch, in 1858 in the New York Dental Journal.
Kingsley was also known for his work related to the vulcanite palatal plate, which consisted of anterior incline that allowed a person to bite forward with their lower jaw.