 In 1912 only two landscape architects and 13 landscape gardeners were listed.Griffin's practice as a landscape architect was first featured in a public text in Wilhelm Miller's "The Prairie Spirit in Landscape Gardening" (1915), which included Griffin as an exponent (along with Jensen, Simonds and architect Frank Lloyd Wright) of his proposed American regional "Prairie" style.Simonds, Griffin and Miller had all attended the first national meeting of the American Society of Landscape Architects (ASLA) in 1913 in Chicago.