He opened his first gallery on Cape Ann in 1974 and from there making is home in Rockport home since 1980. Now the recipient of over 200 awards for his work he has also been featured in several national publications including Yankee and American Artist Magazine. His paintings hang in the permanent collections of large corporations, institutions, banks, and private homes throughout the United States and abroad including the Peabody Museum, Portland Art museum, and the State House in Boston.
For four years, Mosher served as the vice president of the Rockport Art Association* and as well as the curator. He is a member of many organizations, including the Guild of Boston Artists*, New England Watercolor Society, the Copley Society*, International Society of Marine Painters, and the Salmagundi Club*.