Theo van Gogh was a Dutch art dealer and the younger brother of the famous painter Vincent van Gogh. Born on May 1, 1857, in the Netherlands, he played a crucial role in supporting Vincent's artistic career, both financially and emotionally. Theo's unwavering belief in his brother's talent helped Vincent gain recognition posthumously. Theo worked for the art dealership Goupil & Cie, where he developed a keen eye for art. He was instrumental in promoting the works of several artists, including Vincent van Gogh. Theo passed away on January 25, 1891, just six months after Vincent's death, highlighting their deep bond.