Early Life and Education: - Harold Kesling was born in Cass County, Indiana in 1901. - He graduated from Loyola University Chicago in 1923 with a dental degree.

Orthodontic Career: - Harold Kesling opened a private practice in La Porte, Indiana. - In 1929, he opened an orthodontic practice in Hammond, Indiana. - He developed the Positioner appliance during his work in the La Porte office. - His technique attracted many orthodontists to his practice. - He was influenced by Raymond Begg and his light wire technique. - After learning about the Begg technique in Australia, he switched to using it in his treatment. - Harold Kesling gave seminars and lectures on the Begg technique for 40 years.

Contributions to Orthodontics: - Harold Kesling developed the Tip Edge appliance. - He also developed the Positioner appliance. - He was known for his diagnostic setup with consideration of the third dimension.

Awards and Positions: - Harold Kesling was an Honorary President of the North American Begg Society of Orthodontists.

References: - Wells, Neal E. (October 1, 1970). "Application of the positioner appliance in orthodontic treatment." - Kesling, Harold D. (October 1, 1956). "The diagnostic setup with consideration of the third dimension." - Harold D. Kesling (1901–1979). American Journal of Orthodontics. 77 (5): 574–575. May 1, 1980. - Orthodontist Care. Retrieved September 15, 2015.