President, ex. director Worthington Avenue Gallery, Shawnee-on Delaware, Pennsylvania, 1992—2001. Owner James C. Sittig Fine Arts American Paintings, Waverly, since 1989. Juror many art exhibitions, private art dealer, collector, researcher and restorer early 19th to early 20th century American paintings.
Appraiser paintings Monroe County History Society, Stroudsburg, 1999—2003, Western Pocono Library., Bradheaderville, 1999—2006, WYOU television, Scranton, 2001. Member of National Trust History Preservation, Pocono Arts Council, American Museum Britain, Museum American Folk Art, Allentown Art Museum, Smithsonian Institution, Philadelphia Museum Art, Reading Public Museum.