Beginning in the summer of 1960, Neuman and his family began to summer in Maine. In the mid-sixties, Allan Stone, friend and art dealer, traded paintings with Neuman for a home on Mount Desert Island where Neuman established himself as a central figure in the island's vibrant art scene. Over the course of the next six decades, his paintings were featured in dozens of group and solo exhibitions in nearly every major city on the East Coast, as well as numerous cities abroad. Neuman received critical notices from the likes of Dorothy Adlow, Robert Taylor, John Goodrich, Ken Johnson and Thomas Messer  Neuman's first marriage was to Patricia Fedderson in 1947. The couple had two daughters, Elizabeth (b. 1955) and Ingrid (b. 1958), and divorced in the mid-1960s. In 1977, Neuman met gallery director, Mary Susan “Sunne” Savage, and in 1979 they married and welcomed their only child, Christina. Neuman's career as an artist spanned over sixty years, with a resulting body of work that "defies traditional expectations of what an artist's canon should look like". As an artist, he took "a staunchly individualistic approach to his work by never giving in to fads, the demands of the commercial sector or bowing before the critics". Instead, his body of work is characterized by extended series of paintings that explore a particular motif or symbol and are heavily influenced by events in the artist’s own life, in addition to global culture and history. At the beginning of his artistic career, Neuman's work followed in the vein of traditional Abstract Expressionism. Later on, although Neuman continued to use abstract forms in his work and to define himself as an Expressionist, he focused more on the use of symbols in his work. His unique approach to abstract painting prompted former "Boston Globe" art critic Robert Taylor, to refer to Neuman's works as "emblematic abstraction”. Neuman's style is additionally distinguished by his uncompromisingly bold color palette that is reminiscent of Klee, Miró, Seurat, Kandinsky and early 20th century German Expressionists. These bold washes of color are often juxtaposed with graphical, geometric forms influenced by his love of drawing. Neuman frequently incorporates pencil into his works "to define the edges of otherwise illimitable suffusions of color". Another important technique that Neuman incorporates is the inclusion of stamping and taping off areas to define planes of space.