Question: Who has been the  architect for the master plan and expansion of the museum for the past 42 years?
About the article "Metropolitan Museum of Art", section "Architecture".

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After negotiations with the City of New York in 1871, the Met was granted the land between the East Park Drive, Fifth Avenue, and the 79th and 85th Street Transverse Roads in Central Park.
A red-brick and stone "mausoleum" was designed by American architect Calvert Vaux and his collaborator Jacob Wrey Mould.
Vaux's ambitious building was not well received; the building's High Victorian Gothic style being already dated prior to completion, and the president of the Met termed the project "a mistake."
Within 20 years, a new architectural plan engulfing the Vaux building was already being executed.
Since that time, many additions have been made including the distinctive Beaux-Arts Fifth Avenue facade, Great Hall, and Grand Stairway.
These were designed by architect and Met trustee Richard Morris Hunt, but completed by his son, Richard Howland Hunt in 1902 after his father's death.
The wings that completed the Fifth Avenue facade in the 1910s were designed by the firm of McKim, Mead & White.
The modernistic glass sides and rear of the museum are the work of Roche-Dinkeloo.
Kevin Roche has been the architect for the master plan and expansion of the museum for the past 42 years.
He is responsible for designing all of its new wings and renovations including but not limited to the American Wing, Greek and Roman Court, and recently opened Islamic Wing.
As of 2010, the Met measures almost long and with more than of floor space, more than 20 times the size of the original 1880 building.
The museum building is an accretion of over 20 structures, most of which are not visible from the exterior.
The City of New York owns the museum building and contributes utilities, heat, and some of the cost of guardianship.
Roche-Dinkeloo, otherwise known as Kevin Roche John Dinkeloo and Associates LLC (KRJDA), is an architectural firm based in Hamden, Connecticut founded in 1966.
The principal designer is 1982 Pritzker Prize laureate Kevin Roche, with John Dinkeloo — a graduate of the University of Michigan — as the expert in construction and technology.
Roche and Dinkeloo both previously worked with Eero Saarinen.
Almost all buildings built by Roche are with this firm, and they exhibit his particular architecture and aesthetic, although it has changed wildly throughout the past 40 years.
Earlier buildings were characterized by massive facades and experimentation with exposed steel and concrete, while more recent buildings emphasize a clean, glassy look suggesting futuristic and green architecture.
The firm also built in postmodern and historicist styles during the early 1990s.
"KRJDA is engaged in major projects throughout the United States, Europe and Asia and provides complete master planning, programming, architectural design, interior design, working drawings, specification and construction administration services.
The firm has designed a variety of institutional and corporate projects including 38 corporate headquarters, three hotel/apartment buildings, eight museums, numerous research facilities, theaters, schools, factories, performing arts centers, houses and the Central Park Zoo in New York.
For the past 42 years, he has been the architect for the master plan and expansion of the Metropolitan Museum of Art in New York, designing all of its new wings and installing many of its collections."
The firm received the American Institute of Architects 1974 Architectural Firm Award and in 1995 the firm was the recipient of the American Institute of Architect’s 25-Year Award for the Ford Foundation Headquarters in New York City.
In 1982, Kevin Roche received the Pritzker Prize and in 1993, he received the AIA Gold Medal.
Kevin Roche has been referred to as the "first to see architecture and nature as one."
The DTC was established in the early 1970s, and cable companies United Cablevision, United Artists Cable, and later AT&T Broadband, all had their start in, and still have major infrastructure around, the Denver Tech Center.
In the Colorado area, Bill Daniels and John C. Malone were early adopters who shepherded many standards in cable technology still used today.
The Denver Tech Center was designed by Architect/Planner Carl A. Worthington.
In the early 1970s, investors asked Carl A. Worthington to complete a conceptual Master Plan along a new fiber optic line South of Downtown Denver.
The Master Plan included an original 40 acre plan as well as potential for an 800 acre development.
The plan has since grown to 850 acres and over 25 million square feet of buildings have been completed.
The Denver Tech Center was a major reason for Denver Regional Council of Governments's expansion of the T-REX expansion into the Denver Technological Center. 
Plans to expand the Museum were included in the Museum's 2000 Strategic Plan and the 1995 Forest Park Master Plan.
The expansion will include more than of gallery space, including an underground garage, within the lease lines of the property.
The project cost is $130.5 million, along with a $31.2 million endowment to support the incremental costs of operating the larger facility.
The expansion and endowment are being privately funded through gifts to the capital campaign, foundation support, and proceeds from the sale of tax-exempt bonds.
While tax proceeds continue to provide critical annual support for the Museum's operations, tax funds are not being used for the expansion.
In 2005, the Museum Board selected the noted British architect Sir David Chipperfield to design the expansion; Michel Desvigne was appointed landscape architect.
The St. Louis-based firm, Hellmuth, Obata, and Kassabaum (HOK) is the architect of record to work with the construction team.
On November 5, 2007, Museum officials released the design plans to the public and hosted public conversations about those plans.
A model of the new building has since been on display in the museum's Main Hall.
Citing the declining state of the economy in 2008, the museum announced that it would delay the start of the then $125 million expansion.
The project officially broke ground in early 2010 and was completed in 2013.
The Museum remained open during construction. 
Architect and critic.
Campbell entered private practice as an architect in 1975, as a consultant for the improvement or expansion of cultural institutions, including the Isabella Stewart Gardner Museum and the Boston Symphony Orchestra.
He has been an urban design consultant to cities and is an advisor to the Mayors' Institute on City Design, which he helped found.
In 1997 he was architect-in-residence at the American Academy in Rome.
In 2002 he helped plan and appeared in a television series, “Beyond the Big Dig”.