[2] One of Howard's paintings, The Road to Hell, was accepted to the 1920 Salon in Paris and was later exhibited in San Francisco.
[11] In summer 1924, Howard joined his former art teacher Worth Ryder, and artist Chiura Obata on a three months camping and sketching trip to the High Sierra Nevada country in California.
[12][13] That summer, after he completed ornaments for the new Temple Emanuel in San Francisco and for the First Congregational Church in Oakland, he traveled to Europe to study Romanesque sculpture.
[citation needed] His letters describing adventures in Europe, the Middle East, India, Ceylon, and Indonesia were serialized in The Argus newspaper.
[citation needed] In January 1929, the Galerie des Beaux Arts staged a one-man show of his recent drawings, watercolors, and carvings to rave reviews.
[2] Three of the Howard brothers and two of their wives held a joint exhibition in the spring of 1935 at San Francisco's Paul Elder Gallery, where Robert's pastels and paintings were enthusiastically received.
[17][18] In October 1947 he premiered his non-objective art film Meta, which depicted the slow-motion action of various colors dropped into water.
Howard was married to fellow artist Adaline Kent on August 5, 1930, after they worked together on the Pacific Stock Exchange building, a Miller and Pflueger architecture firm project.