Joseph Sullivan deals in antique European textiles of the period spanning the 15th century to the early 20th century. Particular emphasis is placed on tapestries, needlework, crewelwork and other embroidery, but silk brocades, damasks, and velvets, and appliquéd and printed textiles are also handled.

Joseph worked previously for Mayorcas and for Peta Smyth, and served on the vetting committees for the BADA and LAPADA Fairs.