Question: Who produced the 1977 film John Richardson was in?

Context articles: John Richardson (special effects designer)
John Richardson House (Lancaster, New York)
Richardson Professor of Applied Mathematics
Glynrich
John Richardson Homestead
Richardson's Theatre
John Richardson House (Barnstable, Massachusetts)
John G. Richardson
A Bridge Too Far (film)
Rae–Richardson Arctic Expedition

John Richardson (born 1946 in England) is a British special effects supervisor.
 He is best known for his work on the "James Bond" film series (at least "Casino Royale", "Moonraker", "Octopussy", "A View to a Kill" and "Die Another Day"), all the "Harry Potter" film series (2001-2011), "A Bridge Too Far" (1977) and "Aliens" (1986).
 For the latter, he won the Academy Award for Best Visual Effects at the 1987 ceremony.
 He won the BAFTA Award for Best Special Visual Effects for his work on the film "Harry Potter and the Deathly Hallows – Part 2" (2011), for which he was also nominated for an Academy Award at the 2012 ceremony.
John Richardson House is a historic home located at Lancaster in Erie County, New York.
 It is a locally significant and distinct example of the vernacular interpretation of Italianate style.
 It was built about 1840 by John Richardson, a local brickmaker and builder.
The Richardson Chair of Applied Mathematics is an endowed professorial position in the School of Mathematics, University of Manchester, England.
 The chair was founded by an endowment of £3,600 from one John Richardson, in 1890.
 The endowment was originally used to support the Richardson Lectureship in Mathematics.
Glynrich is the site for two historic homes: the Richard Richardson House and the Brick Mill House.
 They are located at Wilmington, New Castle County, Delaware.
 The Brick Mill House, also known as the John Richardson House, was built about 1723, and is a two-story, three-bay, gable roof brick structure with Flemish bond and glazed headers on the facade rising from a full raised basement.
 It has a one-bay, hipped roof, wooden entrance porch.
 The Richard Richardson House was built in 1765, and is a two-story five-bay, center-hall, double pile with a lower single pile two-story wing at the east end.
 It is in the Georgian style.
 It has a five-bay, hipped roof Georgian Revival porch added around 1900.
 The property was the site of extensive milling activities on the Mill Creek in the 18th and 19th centuries.
The John Richardson Homestead is a historic house on Hancock Road in Dublin, New Hampshire.
 The 2-1/2 story wood frame house was built c. 1798 John Richardson, whose brother Abijah built his house further down the road on the same lot.
 The house is basically Federal in massing, five bays wide and two deep, but it was updated later with Greek Revival features, including corner pilasters and a center entry framed by sidelight windows.
Richardson's Theatre or Richardson's Show was a travelling fairground theatre founded in 1798 by John Richardson (1766-1836), which performed in London and the surrounding area in the early nineteenth century.
The John Richardson House is a historic house at 242 Phinney's Lane in the Centerville area of Barnstable, Massachusetts.
 The 1-1/2 story wood-frame Cape style house was built c. 1795 by John Richardson, member of a locally prominent family and the first teacher at the Phinney's Lane School.
 It is four bays wide (a "3/4 house"), with the main entrance and chimney in the second bay from the left.
 The house is one of Centerville's older houses, located near the site of its first meetinghouse and cemetery.
John G. Richardson (born June 29, 1957) is a Maine politician.
 A Democrat, John Richardson formerly served as Commissioner of Economic and Community Development and the Speaker of the Maine House of Representatives.
 Richardson sought the Democratic Nomination for Governor of Maine in 2010.
A Bridge Too Far is a 1977 epic war film based on the 1974 book of the same name by Cornelius Ryan, adapted by William Goldman.
 It was produced by Joseph E. Levine and Richard P. Levine and directed by Richard Attenborough.
The Rae–Richardson Polar Expedition of 1848 was an early British effort to determine the fate of the lost Franklin Polar Expedition.
 Led overland by Sir John Richardson and John Rae, the team explored the accessible areas along Franklin's proposed route near the Mackenzie and Coppermine rivers.
 Although no direct contact with Franklin's forces was achieved, Rae later interviewed the Inuit of the region and obtained credible accounts that the desperate remnants of Franklin's team had resorted to cannibalism.
 This revelation was so unpopular that Rae was effectively shunned by the British Admiralty and popular opinion, and the search for Franklin continued for several years.