Question: What was one of the popularizers of the slogan "the customer is always right" also known as?

Related documents: [0]  [DOC] Harry Gordon Selfridge, Sr. (11 January 1858 – 8 May 1947) was an American retail magnate who founded the London-based department store Selfridges. His 20-year leadership of Selfridges led to his becoming one of the most respected and wealthy retail magnates in the United Kingdom. He was known as the 'Earl of Oxford Street'. [END] 
[1]  [DOC] "The customer is always right" is a motto or slogan which exhorts service staff to give a high priority to customer satisfaction. It was popularised by pioneering and successful retailers such as Harry Gordon Selfridge, John Wanamaker and Marshall Field. They advocated that customer complaints should be treated seriously so that customers do not feel cheated or deceived. This attitude was novel and influential when misrepresentation was rife and "caveat emptor" (let the buyer beware) was a common legal maxim. Variations include ""le client n'a jamais tort"" (the customer is never wrong) which was the slogan of hotelier César Ritz who said, "If a diner complains about a dish or the wine, immediately remove it and replace it, no questions asked". A variation frequently used in Germany is ""der Kunde ist König"" (the customer is king), while in Japan the motto ""okyakusama wa kamisama desu"" (お客様は神様です ) meaning "the customer is a god", is common. [END]  
Answer: the 'Earl of Oxford Street'
the 'Earl of Oxford Street'