Skidmore, Owings & Merrill

Many of SOM's postwar designs are recognized as icons of American modern architecture. The firm's most influential early project was Lever House, completed in 1952 to become the first International Style office building in New York City. Constructed of glass and steel at a time when Park Avenue was lined with masonry buildings, Lever House introduced a sleek modernist aesthetic that embodied the spirit of the times and influenced an entire generation of high-rise construction. As architectural historian Reyner Banham wrote in 1962, “It gave architectural expression to an age just as the age was being born ... Lever House was an uncontrollable success, imitated and sometimes understood all over the Americanized world, and one of the sights of New York”.[11] In 1982, the New York City Landmarks Preservation Commission designated Lever House an official landmark in the first year of its eligibility, making it at the time the city's most contemporary landmark.[12] SOM's influential modernist work in New York City included the Manufacturers Trust Company Building, completed in 1954 as the first International Style bank building in the United States,[13] and the Pepsi-Cola World Headquarters, completed in 1960. Architectural historian Henry-Russell Hitchcock called the Pepsi building “the ultimate in refinement of proportion and elegance of materials,” while New York Times critic Ada Louise Huxtable placed it "at the top of the list, with Seagram and Lever House, of the city's few modern landmarks."[14] The following year saw the completion of One Chase Manhattan Plaza (1961), the first International Style building to rise in New York City's Financial District. The project is noted for helping to turn the tide of a corporate exodus to Midtown and the suburbs and reasserted Lower Manhattan as a viable business district after years of decline. SOM's design also transformed the crowded streetscape of the Financial District by creating a 2.5-acre plaza surrounding the tower, a novel concept that would be adapted in many future projects. Another key example of SOM's modernist legacy is found in Colorado Springs, Colorado, where SOM master-planned a campus for the U.S. Air Force Academy. Built between 1958 and 1968, the campus broke from the traditions of West Point and Annapolis to become the first U.S. military academy designed in the modern style.[15] The centerpiece of the campus is the Cadet Chapel, designed by architect Walter Netsch. The American Institute of Architects awarded the building with its prestigious Twenty-five Year Award, conferred on architectural works of enduring significance.

SOM has a long history of innovation in sustainable architecture and design. Already in 1969, SOM founder Nathaniel Owings wrote, “Civilizations leave marks on the Earth by which they are known and judged. In large measure, the nature of their immortality is gauged by how well their builders made peace with the environment.” (source: Nathaniel Owings, “The American Aesthetic,” Harper & Row, 1969) This ethos has shaped the firm's journey into sustainable practices. An early example is the headquarters it designed for Weyerhaeuser Company, completed in 1971, which has been called the “original green building” not only for its integration into the surrounding landscape, but also for its innovative use of efficient building systems. Another milestone in large-scale sustainable architecture was the completion of the U.S. Census Bureau Headquarters in 2007, the first federal office building to receive LEED certification. Like Weyerhaeuser, the design of the campus works in concert with its natural surroundings and incorporates a range of design strategies to reduce its environmental impact.

In 2015, SOM completed the first net-zero-energy school building in New York City and one of the first worldwide. The Kathleen Grimm School for Leadership and Sustainability at Sandy Ground,[16] located in Staten Island, has been awarded for its sustainability performance by organizations including the American Institute of Architects, the Municipal Art Society, and Urban Land Institute.

In the 1970s, SOM pioneered a new era of skyscraper design with its work in Chicago, including the John Hancock Center (completed 1970) and Willis Tower (formerly Sears Tower), which became the world's tallest structure upon its completion in 1973 and remained so for more than 20 years. Both towers are the result of collaboration between architect Bruce Graham and engineer Fazlur Rahman Khan, who is often considered to be the greatest structural engineer of the 20th century. Khan invented a tubular framing system that made it possible to build higher than ever before. This system has been adapted and is still used today for some of the world's most recent tallest buildings, including the 828-meter-tall Burj Khalifa, designed by SOM and completed in 2010.

In the 1960s and 1970s, SOM was an early leader in computer-aided design, developing in-house digital tools that preceded the CAD systems used widely today. This work quickly proved valuable in the generation of structural analysis tools that were embraced by Fazlur Khan and his engineering team, aiding the design of projects such as the John Hancock Center.

The activity of an experimental research group at SOM known as the Computer Group exemplifies a particularly productive effort within the firm to incorporate technological research into its practice. Through the 1970s and 1980s, members of the relatively small, dedicated group pushed to integrate the computer's enhanced data-storing and analytical abilities into various phases of the design process. Through these initiatives, SOM was able to identify the potential of the computer to not only expedite necessary calculations but also introduce new ways of representing and sharing information. Just as structural engineering came to be seen early on at SOM as a means of generating rather than simply realizing architectural ideas, with concerted effort, computers gained credence at the firm, and eventually throughout the industry, as a catalyst for architectural innovation. In 1980, an in-house team at SOM created Architecture Engineering Systems, a computer program that was used to study complex structural systems and energy demands.[17] This program is regarded as a precursor to the array of building information modeling (BIM) tools now used by the profession.

For decades, many of SOM's projects have featured works of art by significant artists. In many cases, the firm's architects and engineers played an essential role in commissioning, engineering, and installing the artworks—such as with the Chicago Picasso, a 50-foot-tall steel sculpture in the city's civic center. Joan Miró, Alexander Calder, Isamu Noguchi, Harry Bertoia, Richard Lippold, and Jean Dubuffet are among the artists whose work has been an integral part of SOM projects. More recently, SOM's architects and engineers have collaborated with artists such as James Turrell, Janet Echelman, Iñigo Manglano–Ovalle, James Carpenter, and Jaume Plensa.

Gordon Bunshaft, who thrived as a design leader at SOM for more than 40 years, received the profession's highest honor, the Pritzker Architecture Prize, in 1988. Notable architects who are associated with SOM include: T. J. Gottesdiener, Edward Charles Bassett,[18] Natalie de Blois,[19][20] Gordon Bunshaft,[21][22] David Childs,[23][24] Robert Diamant,[25] Myron Goldsmith,[26][27] Bruce Graham,[28][29] Gary Haney, Craig W. Hartman,[30] Gertrude Kerbis,[31] Fazlur Rahman Khan.[32] Lucien Lagrange,[33] Walter Netsch,[34][35] Larry Oltmanns,[36] Eszter Pécsi,[37] Brigitte Peterhans,[38][39] Norma Merrick Sklarek, Adrian Smith,[40] and Marilyn Jordan Taylor[41]

Since the firm's founding, SOM has led large scale urban design and planning projects. Many of these projects have had a lasting role in the development of cities and urban areas in America and the world, including London, Chicago, New York City, Washington, D.C., Baltimore, Denver, and Portland, Oregon. SOM's City Design practice has made influential contributions to urban design approaches such as transit-oriented development, overbuild strategies and sustainable urbanism. In 1942, SOM was hired by the U.S. Army Corps of Engineers for a highly confidential project: the planning of Oak Ridge, Tennessee. By 1945, the town was home to 75,000 people. The work at Oak Ridge prepared SOM to take on the large-scale architectural and planning projects that would define the postwar era.

For more than 20 years, SOM was involved in the development of a master plan for the National Mall in Washington, D.C. In 1962, President John F. Kennedy appointed Nathaniel Owings as chair of the Pennsylvania Avenue redesign council, and the resulting 1966 Washington Mall Master Plan laid the framework for a dynamic, inviting, and pedestrian-friendly place. A second master plan developed in 1973, envisioned the construction of major cultural facilities, including the National Air and Space Museum, the Hirshhorn Museum and Sculpture Garden, and the National Gallery of Art Sculpture Garden. In Baltimore in the 1960s, SOM played a pivotal role in preventing the destruction of the city's historic districts and Inner Harbor to make way for the planned construction of an elevated highway. As the chair of a team to develop an alternate plan, Nathaniel Owings convinced the Federal Highway Administration to sign off on a plan to reroute the highway. It eventually built around the harbor and the historic Federal Hill district, saving these irreplaceable neighborhoods.

In the 1970s, SOM collaborated with landscape architect Lawrence Halprin to plan and design the Portland Transit Mall. The goals were to revitalize the Oregon city's downtown area, to encourage the use of mass transit, and create walkable streets. The Transit Mall helped to change the perception of downtown Portland. As one of the first projects of its kind in the United States, it helped to usher in an era of streetscape design that prioritizes people. Another important commission in the 1970s was as the lead design firm for the Boston Transportation Planning Review, a metropolitan wide re-design of Boston's entire transit and roadway infrastructure.

Beginning in the 1980s, SOM planned the design and construction of Canary Wharf in London. Intended to accommodate a flourishing financial sector and revitalize London's former Docklands, the plan included more than 20 building sites and a host of public spaces and amenities. The plan also provided for a robust transportation network including a light rail station that connects to the London Underground. The massive scale of the project led to the opening of SOM's London office in 1986. The firm's work at Canary Wharf continued into the new millennium, with the completion of Five Canada Square in 2002. In central London, the opportunity to build above rail lines near Liverpool Street Station spurred the construction of Broadgate, a new business district. SOM devised the master plan, and over three decades, designed several of the site's 14 buildings. In order to build high-rise structures atop one of the city's busiest stations and its railyard, SOM's structural engineering team devised a deck over the tracks to allow for various building configurations on top. Exchange House, completed in 1990, is a building that acts as a bridge spanning the tracks. In 2008, Broadgate Tower, the district's tallest building, was completed. SOM also designed public space enhancements for the area.

SOM designed the master plan for Chicago's Millennium Park, which opened in 2004 and has become one of the city's most visited attractions. Constructed above bus lanes, parking garages, and a rail yard, Millennium Park can be considered the world's largest roof garden. Below the great lawn, two new levels of parking were built, bus stops were added, and rail stations were renovated and expanded, including Millennium Station. The project revitalized a formerly blighted downtown site and marked the completion of Chicago planner Daniel Burnham’s 100-year vision for the area.

In Denver, SOM was commissioned to expand and transform the city’s historic Union Station into a major regional hub. 20 acres of former rail yards have been converted into a transit-oriented urban district that orchestrates light rail, pedestrian, bicycle, and bus routes, as well as commuter and intercity rail. Completed in 2014, the project has spurred more than $3.5 billion worth of private investment in the surrounding district.[49]

The earliest SOM engineer was John O. Merrill.[50] Fazlur Khan, another engineer at SOM, is best known for his design and construction of the Willis Tower (formerly the Sears Tower), and John Hancock Center and for his designs of structural systems that remain fundamental to all high-rise skyscrapers.[51] Indeed, Khan is responsible for developing the algorithms that made the Hancock building and many subsequent skyscrapers possible. Another notable SOM engineer is Bill Baker, who is best known as the engineer of Burj Khalifa (Dubai, 2010), the world's tallest man-made structure. To support the tower's record heights and slim footprint, he developed the "buttressed core"[52] structural system, consisting of a hexagonal core reinforced by three buttresses that form a Y shape.

Davis Allen, a pioneer in corporate interior design, had a forty-year tenure at SOM.[53] The designer of the iconic Andover chair, Allen was an institution in "the profession he helped to establish—the total design of the interior corporate environment with furniture, art, and functional and decorative objects integrated into a comprehensively planned space.”[54]