Question: Rock Lawn and Carriage House was designed by which American architect?

Context paragraphs:
W.T.S. White House and Carriage House: The W.T.S. White House and Carriage House are historic buildings located in Clarinda, Iowa, United States.  White created his fortune as president of the Clarinda Poultry Butter and Egg Company.  He hired local architect William W. Welch to design his house.  It and the carriage house were completed in 1906, and White moved to Chicago the following year.  He sold the property to A.U. and Agnes Hunt for $8,000.  The house and carriage house were listed together on the National Register of Historic Places in 1994.  Both structures are Colonial Revival in style.  The 2½-story frame house features Tuscan columns on the front porch, dentil cornice, and diamond lights in the second floor windows.  The two story carriage house measures 25 by , and is located behind the main house.  It originally housed a horse and buggy, and has been transformed into an automobile garage.

Rock Lawn and Carriage House: Rock Lawn is a historic house in Garrison, New York, United States.  It was built in the mid-19th century from a design by architect Richard Upjohn.  In 1982 it was listed on the National Register of Historic Places along with its carriage house, designed by Stanford White and built around 1880.

Carriage House Studios: Carriage House Studios is a recording studio located in the suburbs of Stamford, Connecticut.  Established in 1980, the Carriage House has recorded well-known artists like Diana Ross, Derek Trucks, Johnny Winter, Meatloaf, Rakim, Pantera, Ronnie Dio, Phyllis Hyman, Spyro Gyra, and The Pixies.  Throughout the 1980s, the Carriage House also recorded orchestral parts for B-movies, such as "Missing in Action" and "Silver Bullet".  Voice-overs for "Shrek 2" were also recorded at the Carriage House.

Wedding Cake House (Kennebunk, Maine): Called the "most photographed house in the state" of Maine, the Wedding Cake House, known formally as the George W. Bourne House, is a historic house located at 104 Summer Street in Kennebunk, Maine.  The home was built in 1825 by shipbuilder George W. Bourne (1801–1856), who later built a frame barn which he connected to the main house with a carriage house.  In 1852, the barn caught fire and the carriage house was demolished to keep the fire from spreading to the house.  Bourne, who during a European tour had been impressed by the Gothic beauty of the cathedral at Milan, rebuilt the carriage house and barn in what later came to be known as Carpenter Gothic style.  Using hand tools, he crafted five buttresses with pinnacles on top of each.  Then in order to tie the new structures in with the existing house, he added six buttresses with pinnacles to the house and then joined them together with intricate woodwork.  His only help in doing this was Thomas Durrell, an apprentice ship's carpenter.  Bourne spent the rest of his life adding to these embellishments.  It has been said of Bourne: "The highly skilled carpenter knew no limits to his skill."

Waldron–Beck House and Carriage House: Waldron–Beck House and Carriage House is a historic home and carriage house located at Lafayette, Tippecanoe County, Indiana.  The house was built in 1877, and is a two-story, irregularly shaped Italianate style brick dwelling, with a rear service wing.  It sits on a stone foundation and has a multi-hipped roof with bracketed cornice.  It features a three-sided, two-story projecting bay.  The carriage house is a two-story, three bay brick building.  It has a hipped roof with cupola and a bracketed cornice.

Ginn Carriage House: The Ginn Carriage House is a historic carriage house at 24 Ginn Road in Winchester, Massachusetts.  The building, which has been converted to a residence, is one of two surviving outbuildings (the other is the gardener's house) of the extensive "Terrace of Oaks" estate of publisher Edwin Ginn, whose main house was demolished in 1946.  The U-shaped brick carriage house, built in 1900, exhibits high quality construction details, and has touches of Georgian Revival styling.  The original doors to the carriage area are still attached to the building, sheltered by a copper shed roof.

Abram Huston House and Carriage House: Abram Huston House and Carriage House, also known as the Coatesville City Hall and Police Station and "Graystone Mansion," is a historic building located at Coatesville, Chester County, Pennsylvania.  It was designed and built in 1889, by the noted architectural firm of Cope & Stewardson.  The house is a 2 1/2-story building, built of shaped coursed stone, irregularly shaped in plan, and has a two-story wing added in 1925.  The carriage house is "L" shaped, and features a two-story tower with a conical roof.  The house was built as the home of Abram Huston, president of the Lukens Steel Company.  The house was Coatesville City Hall and the carriage house was the Coatesville jail from 1939 to 1992.

Stanford White: Stanford White (November 9, 1853 – June 25, 1906) was an American architect and partner in the architectural firm McKim, Mead & White, the frontrunner among Beaux-Arts firms.  He designed a long series of houses for the rich, and numerous public, institutional, and religious buildings.  His design principles embodied the "American Renaissance".

Howard Mansion and Carriage House: Howard Mansion and Carriage House is a historic mansion and carriage house in Hyde Park, New York.  It was designed by architect Charles Follen McKim (1847-1909) and built in 1896.  It is a two-story, six-bay, eclectic dwelling built of uncoursed fieldstone.  The house is rectangular in plan and has a wood shingled roof with overhanging twin gables.  The front entrance is a Dutch door and features a portico supported by two square, bracketed columns.  The carriage house is a two-story, wood frame, stucco covered, Tudor style building built in 1901.  It features a two-story, polygonal bay with a polygonal roof.  Frederick W. Vanderbilt had the house built for his nephew, Thomas H. Howard.

Philip A. Wolff House and Carriage House: The Philip A. Wolff House and Carriage House, also known as Belmont Hill, is a historic building located in Cedar Rapids, Iowa, United States.  An Ohio native, Wolff lived in several states and the West Indes before settling in Maquoketa, Iowa.  He moved to Cedar Rapids where he established a brickworks with his son.  Wolff had this two-story vernacular Italianate house and accompanying carriage house built in 1883 with bricks made at his business, which was on the same grounds.  At the time it was built, the house was located in a suburban area of Cedar Rapids.  This was during a period of economic growth for the city.  The house features paired brackets under the eaves, the windows have brick arches above and limestone sills, a three-sided, two-story bay, and a projecting center pavilion.  The carriage house is architecturaly similar to the main house.  They were listed together on the National Register of Historic Places in 1982.

Supporting paragraphs: Rock Lawn and Carriage House Stanford White
Answer: Stanford White