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

Context paragraphs:
Nutrient film technique: Nutrient film technique (NFT) is a hydroponic technique wherein a very shallow stream of water containing all the dissolved nutrients required for plant growth is re-circulated past the bare roots of plants in a watertight gully, also known as channels.  NFT was developed in the mid 1960s in England by Dr. Alen Cooper.  In an ideal system, the depth of the recirculating stream should be very shallow, little more than a film of water, hence the name 'nutrient film'.  This ensures that the thick root mat, which develops in the bottom of the channel, has an upper surface, which, although moist, is in the air.  Subsequent to this, an abundant supply of oxygen is provided to the roots of the plants.  A properly designed NFT system is based on using the right channel slope, the right flow rate, and the right channel length.  The main advantage of the NFT system over other forms of hydroponics is that the plant roots are exposed to adequate supplies of water, oxygen and nutrients.  In earlier production systems, there was a conflict between the supply of these requirements, since excessive or deficient amounts of one results in an imbalance of one or both of the others.  NFT, because of its design, provides a system wherein all three requirements for healthy plant growth can be met at the same time, provided that the simple concept of NFT is always remembered and practiced.  The result of these advantages is that higher yields of high-quality produce are obtained over an extended period of cropping.  A downside of NFT is that it has very little buffering against interruptions in the flow, e.g., power outages, but, overall, it is one of the more productive techniques.

Yamagata Masakage: Yamagata Masakage (山県 昌景 , 1524 – June 29, 1575) was a Japanese samurai warrior of the Sengoku period.  He is known as one of the "Twenty-Four Generals of Takeda Shingen".  He was famous for his red armour and skill in battlefield, and was a personal friend of Takeda Shingen.  He was the younger brother of Obu Toramasa who was also a retainer of Shingen leading the famous "red fire unit" (derived from Shingen's slogan Fūrinkazan).  After his brother committed Seppuku as a cover for Takeda Yoshinobu's failed rebellion, Masakage took the red fire unit title and outfitted his cavalry in bright red armor.  It was said that his cavalry would always charge first in battle; sowing confusion and panic in the enemy ranks.

The customer is always right (disambiguation): The customer is always right is a popular slogan within the service industry.

Slatest: Slatest, also known as The Slatest, is a news blog that has been published by Slate since 2009, when it was launched to replace their 12-years-old "Today's Papers" feature.  It also replaced Slate's magazine aggregator feature "In Other Magazines".  In 2011, the website was redesigned; the effects included making its homepage more closely resemble the Huffington Post and creating a home for Slate's "Trending News Channel" video project.  In 2012, it was redesigned again, this time to focus more on the writing and editorial decisions of Josh Voorhees, who was then the blog's editor.  This redesign also gave the blog a new slogan: "Your news companion."  After this redesign was announced, Voorhees said, “The average Slate writer takes a little bit longer to craft a really definitive or provocative piece.  The Slatest will always be that kind of ‘first responder’ for the site."

Harry Gordon Selfridge: 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'.

Connect Four: Connect Four (also known as Captain's Mistress, Four Up, Plot Four, Find Four, Fourplay , Four in a Row, Four in a Line and Gravitrips (in Soviet Union)) is a two-player connection game in which the players first choose a color and then take turns dropping colored discs from the top into a seven-column, six-row vertically suspended grid.  The pieces fall straight down, occupying the next available space within the column.  The objective of the game is to be the first to form a horizontal, vertical, or diagonal line of four of one's own discs.  Connect Four is a solved game.  The first player can always win by playing the right moves.

Next-best-action marketing: Next-best-action marketing (also known as best next action or next best activity), as a special case of next-best-action decision-making, is a customer-centric marketing paradigm that considers the different actions that can be taken for a specific customer and decides on the ‘best’ one.  The Next Best Action (an offer, proposition, service, etc.) is determined by the customer’s interests and needs on the one hand, and the marketing organization’s business objectives, policies on the other.  This is in sharp contrast to traditional marketing approaches that first create a proposition for a product or service and then attempt to find interested and eligible prospects for that proposition.  This practice, direct marketing, typically automated in the form of a campaign management tool, is often product-centric, and usually always marketing-centric.

The customer is always right: "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.

Bernama News Channel: Bernama News Channel, also known as BNC, is a 24-hour international news and current affairs television network in Malaysia.  It is owned by Bernama, a government news agency.  This channel airs news programmes that are related to local and international business, lifestyle, sports and entertainment.  It is broadcast on the Astro satellite television platform via Channel 502, HyppTV via Channel 410 (previously channel 120, prior to April 2013) and the Fine TV IPTV-based network via Channel 12.  Bernama News Channel's slogan is "Baru & Benar" (Malay for "Right & Now").

Lied der Partei: The "Song of the Party" (German: "das Lied der Partei" ), also known as "Die Partei hat immer recht" (English: The Party is always right ) was the party song of the Socialist Unity Party of Germany, the ruling party of East Germany.  It was written by Louis Fürnberg.  It is best known by the first line of its chorus: "Die Partei, die Partei, die hat immer recht " (English: The Party, the Party, is always right ).

Supporting paragraphs: The customer is always right Harry Gordon Selfridge
Answer: the 'Earl of Oxford Street'