John S. Pearson was born in England in 1811. He was first listed in Brooklyn in 1867 with the occupation of "Hair Oil." It is not certain when he got started, however an ad in the April 21, 1866 Harper's Weekly listed 286 Jay Street as his Depot. He probably got started in 1865. In 1868 he listed his occupation as: "Hair Rejuvenator," and he continued with this tile for most of the years between that time and 1883. He was also listed as "Hair Dyes" in 1869 and 1879, "Hair Tonic" in 1871, "Patent Medicines" in 1880, and "Agent" in 1884. His business address was the same as his home address and it was at 286, and later 388 Jay Street. He was listed with a home address only in 1889 and 1890. According to the Wilsons, the product name changed from Rejuvenator to Restorer in the 1880s, and he went out of business around 1890. I found "Pearson's Hair Rejuvenator" still listed for sale in the 1885 McKesson & Robbins catalog.