Julian Onderdonk (July 30, 1882 – October 27, 1922) was a Texan Impressionist painter, often called "the father of Texas painting." Julian Onderdonk was born in San Antonio, Texas, to Robert Jenkins Onderdonk, a painter, and Emily Gould Onderdonk. He was raised in South Texas and was an enthusiastic sketcher and painter. As a teenager Onderdonk was influenced and received some training from the prominent Texas artist Verner Moore White who also lived in San Antonio at the time. He attended the West Texas Military Academy, graduating in 1900.