Keith Sheridan grew up with a innate love of drawing and painting; his mother was an accomplished amateur painter and her two sisters were both painting instructors. As a young boy, he enjoyed studying the work of the masters, saving his allowance to buy art books.

Pursuing his artistic interests he attended Pratt Institute, earning a BFA with honors. After working for several years as a graphic designer, he opened his own design studio. During his 25 years in that business, his work for national and international corporations as well as not-for-profit organizations won over 35 awards for excellence from the country's most prestigious design associations.

His love of art resulted in a passion for collecting, first of Japanese prints and later American and European graphics—the immediacy of the print mediums appealing to his appreciation of fine design, technical precision, and expressive diversity. His enjoyment of collecting led him to retire from the design business and devote himself fulltime to the buying and selling of fine art. A private dealer specializing in the first half of the 20th century, he is dedicated to offering works of exceptional quality, artistic merit, and historical significance.