Coghlan opened his own studio in the 1960s. In 1967 he traveled to
Israel and
Jordan, sponsored by a group of collectors. When he returned his entire production from the trip was purchased by the International Art Society, over sixty paintings and several pencil drawings. He was a co founder of the Sociedad Mexicana de Acuarelistas (Mexican Society of Watercolorists) to promote the idea that this medium should be considered equal to other forms of painting. Coghlan’s work can be found in the collections of the
Museo de Arte Moderno, the Museo de Arte in Sinaloa, Mitchel Museum in
Mount Vernon, Illinois, the
John F. Kennedy Presidential Library and Museum, the
Ronald Reagan Presidential Library,
Alfredo Guati Rojo National Watercolor Museum and various universities as well as in private collections in Mexico, the United States, Canada, Germany, Greece, the Netherlands, Scotland and Chile. His work was a favorite among Mexican presidents of the latter 20th century such as
Adolfo López Mateos,
Gustavo Díaz Ordaz,
Luis Echeverría,
Miguel de la Madrid and
Carlos Salinas de Gortari . ==Artistry==