Asian families where there may be religious objections for men to work closely with women in a household. Western female celebrities may also prefer a female butler, as may households where the wife is driving the decision to hire a butler. Despite these trends, the Ivor Spencer School asserts that female butlers are not easily placed, on the whole. In ancient times, the roles precursive to butlering were reserved for chattel or those confined within heredity-based class structures. With the advent of the medieval era, butlering became an opportunity for social advancement‒even more so during Victorian times. Although still based upon various antecedent roles as manifested during different eras, butlering today has frequently taken over many of the roles formerly reserved for lower-ranking domestic servants. At the same time it has become a potentially lucrative career option. Notable butlers Eugene Allen, White House butler who served under seven U.S. presidents Leslie Bartlett, butler, toastmaster; and founder of The London School of British Butlers Paul Burrell, butler to Diana, Princess of Wales Alonzo Fields, White House chief butler from 1932 to 1953 Grant Harrold butler to Charles, Prince of Wales from 2004 to 2011 In visual art Butlers have been occasionally depicted in visual art. A famous painting, Heads of Six of Hogarth's Servants (c. 1758), is unique among such works. In it, the 18th-century English artist William Hogarth depicted his household servants, all surrounding the butler. In showing the group in a close-knit assemblage rather than in the performance of their routine household duties, Hogarth sought to humanise and dignify them in a manner akin to wealthy-class members, who were the normal subjects of such portraits. While this was a subversive act that certainly raised many eyebrows in his day‒Hogarth conspicuously displayed the work in his estate home in full view of guests‒at the same time he had painted his servants' facial expressions to convey the sincerity and deference expected of servant-class members. In contemporary art, "The Butler's in Love" series by U.S. artist Mark Stock is especially poignant. In the series, Stock portrays the butler as sick with love, but the possibility of fulfillment is hopeless: the love is a forbidden love, perhaps felt for the lady of the house, and so it must be suffered alone in silent concealment. In addition to the ongoing mannerisms and facial expressions of the butler, a seated lady once appearing in a