"Symbolic Abstraction" was the term Hagedorn used to reference his work, which spanned the 1950s to the 21st century. He employed the mediums of painting, drawing, watercolor and gouache. Through the decades the connective tissue throughout his output was his vivid colors, forms, and shapes. His work relates all these elements in the search  for a connection between the human  system, spirit, and the world it simultaneously reflects and creates.