Question: Who formed the UK-based global retailer for which David Bernstein was the former chairman?

Context paragraphs:
Bernstein–Kushnirenko theorem: Bernstein–Kushnirenko theorem (also known as BKK theorem or Bernstein–Khovanskii–Kushnirenko theorem ), proven by David Bernstein and in 1975, is a theorem in algebra.  It claims that the number of non-zero complex solutions of a system of Laurent polynomial equations "f" = 0, ..., "f" = 0

GT200: The GT200 is a fraudulent "remote substance detector" that was claimed by its manufacturer, UK-based Global Technical Ltd, to be able to detect, from a distance, various substances including explosives and drugs.  The GT200 was sold to a number of countries for a cost of up to £22,000 per unit, but the device has been described as little more than "divining rods" which lack any scientific explanation for why they should work.  After the similar ADE 651 was exposed as a fraud, the UK Government banned the export of such devices to Iraq and Afghanistan in January 2010 and warned foreign governments that the GT200 and ADE 651 are "wholly ineffective" at detecting bombs and explosives.  The owner of Global Technical, Gary Bolton, was convicted on 26 July 2013 on two charges of fraud relating to the sale and manufacture of the GT200 and sentenced to seven years in prison.

French Connection (clothing): French Connection (also branded as FCUK) is a UK-based global retailer and wholesaler of fashion clothing, accessories and homeware.  Founded in the early 1970s by Stephen Marks, who remains chief executive, it is based in London and its parent French Connection Group PLC is listed on the London Stock Exchange.

Beauty Brands: Beauty Brands Inc. is a salon and spa superstore developed and founded by the advertising company, Bernstein-Rein.  The company headquarters is located in Kansas City, Missouri.  The company was purchased in November 2013 by a private California-based company replacing Bob Bernstein and David Bernstein with Lyn Kirby as the CEO and Rich Bos as President respectively.

Elliot G. Sander: Elliot "Lee" Sander is the former Executive Director and CEO of the Metropolitan Transportation Authority (MTA) and the Commissioner of the New York City Department of Transportation.  Sander is the President and CEO of The HAKS Group Inc., an architectural and engineering firm based in New York and Chairman of the Regional Plan Association, and serves as a non-executive Board member of the National Express Group (NEX), a UK-based global operator of rail, bus, para-transit, and school bus services.  He is on the Board of the Greater Jamaica Development Corporation and the Leo Baeck Institute.  He now works at The I-Grace Company as president.

The David Project: The David Project is a pro-Israel non-profit located in Boston, Massachusetts.  The David Project's stated aim is "to positively shape campus opinion on Israel by educating, training, and empowering student leaders to be thoughtful, strategic and persuasive advocates" through relational advocacy.  It was founded in 2002 by Charles Jacobs, who served as its president until August 2008.  David Bernstein, previously Program Director of American Jewish Committee (AJC), began leading The David Project in July 2010.  In September 2014, Phillip Brodsky became Executive Director.

David Bernstein (executive): David Alan Bernstein CBE (born 22 May 1943) is a British business executive who is the chairman of the British Red Cross, member of the advisory board at Cogress Ltd and was the former chairman of French Connection.

Ian Lang Livingstone: Ian Lang Livingstone, CBE, DL (born 23 February 1938) is a Scottish businessman; former Chairman of the board of Motherwell College; former Chairman of Motherwell Football Club; former Chairman of Lanarkshire Health Board; and former Chairman of the Lanarkshire Development Agency.

Charles Dunstone: Sir Charles William Dunstone, CVO (born 21 November 1964) is the co-founder and former chairman of mobile phone retailer Carphone Warehouse, former chairman of multinational electrical and telecommunications retailer and services company Dixons Carphone (formed on 7 August 2014 by the merger of Dixons Retail and Carphone Warehouse), and executive chairman of the TalkTalk Group.

Levitt Bernstein: Levitt Bernstein is an architecture, landscape architecture and urban design practice established in 1968 by David Levitt and David Bernstein with studios in London and Manchester.  Levitt Bernstein's long-standing commitment to housing and urban design is balanced by many projects in the arts, education and cultural sectors, as well as health, offices, retail and community-based schemes.  The practice is proud to have won many awards.

Supporting paragraphs: David Bernstein (executive) French Connection (clothing)
Answer: Stephen Marks