List of ambassadors of São Tomé and Príncipe to the United States

H2 USA is a hybrid organization governed by a partnership affiliated with the United States private sector economy and the public sector services. The alliance is supportive of a hydrogen economy and hydrogen technologies with a representation by more than thirty cooperatives considering associations, automakers, energy companies, fuel cell suppliers, materials and component manufacturers, national laboratories, non-governmental organizations, and the United States Department of Energy.

Qorvis is an international Washington, D.C.-based public relations, advertising, media relations and crisis communications firm. It was acquired by the Publicis Groupe in January 2014, and became Qorvis/MSLGroup.On December 31, 2022, Qorvis was sold by Publicis to a group led by long-time Qorvis executive Matt J. Lauer.Qorvis provides public relations (PR) representation on behalf of a range of public companies, financial services firms, sovereign nations, and wealthy individuals. During the late-2000s financial crisis, Qorvis represented Wells Fargo and AIG.

The name "M Street" refers to two major roads in the United States capital of Washington, D.C. Because of the Cartesian coordinate system used to name streets in Washington, the name "M Street" can be used to refer to any east-west street located twelve blocks north or south of the dome of the United States Capitol (not thirteen blocks, as there is no J Street). Thus, in all four quadrants of the city there are streets called "M Street", which are disambiguated by quadrant designations, namely, M Street NW, NE, SW, and SE.

Nuns of the Battlefield is a public artwork made in 1924 by Irish artist Jerome Connor, located at the intersection of Rhode Island Avenue NW, M Street, and Connecticut Avenue NW, in Washington, D.C., United States. A tribute to the more than 600 nuns who nursed soldiers of both armies during the American Civil War, it is one of two monuments in the District that mark women's roles in the conflict. It is a contributing monument to the Civil War Monuments in Washington, D.C., listed on the National Register of Historic Places. In 1993, it was surveyed for the Smithsonian Institution's Save Outdoor Sculpture! program.

Henry Wadsworth Longfellow is a bronze statue, by William Couper, and Thomas Ball. The statue depicts American poet Henry Wadsworth Longfellow. It is located at the intersection of M Street and Connecticut Avenue, N.W. Washington, D.C., and was dedicated on May 7, 1909.After the death of Henry Wadsworth Longfellow in 1882, there were several plans to memorialize him. His bust was placed at Poets' Corner in Westminster Abbey in 1884 and a statue of the poet by Franklin Simmons was unveiled in his native town of Portland, Maine, at what became known as Longfellow Square. For the statue in Washington, an association was founded to raise money for the effort, ultimately earning $21,000 by subscribers. Additionally, Congress offered another $4,000 and the site. Members of the organization included Andrew Carnegie, Henry Cabot Lodge, Charles William Eliot, Edward Everett Hale, Julia Ward Howe, and Curtis Guild. Theodore Roosevelt served as Honorary Regent. It was unveiled in 1909 by the poet's granddaughter Erica Thorp in the presence of Chief Justice Melville Fuller and the United States Marine Band.

The General Federation of Women's Clubs Headquarters, also known as the Miles Mansion, is a social clubhouse headquarters in Washington, D.C. Built as a private residence in 1875, it has served as the headquarters of the General Federation of Women's Clubs (GFWC) since 1922. It was declared a National Historic Landmark in 1991 for its association with the federation, which serves as an umbrella organization for women's clubs, a social movement dating to the mid-19th century. Tours of the headquarters, available by appointment, provide information about the activities of the GFWC and several historic rooms, including the 1734 entryway, the Julia Ward Howe Drawing Room, the dining room, music room and the GFWC International President's office. The headquarters also features changing exhibits of art, photographs and artifacts from its collections.

The Demonet Building is composed of a historic townhouse and adjoining office building on the southeast corner of Connecticut Avenue and M Street NW in Washington, D.C. Constructed in 1880, the townhouse is the last Victorian residence on Connecticut Avenue between Dupont Circle and Farragut Square that has not been significantly altered. It features an octagonal tower topped by a dome with cartouche windows. Following a multi-year legal battle to demolish the townhouse, which had been added to the District of Columbia Inventory of Historic Sites in 1979, the Demonet Building and adjoining lot were sold for what was then a record price for downtown real estate. The adjoining office building, designed by Skidmore, Owings & Merrill, was completed in 1984. The building's namesake, John Charles Demonet, established a confectionery business on Pennsylvania Avenue in 1848. During the next several decades, he and his family grew the business into a successful company that included catering services. It was a confectionery supplier for the White House. In the early 1900s, the business was moved to Connecticut Avenue, a fashionable residential area at the time. It became a commercial pioneer of what was nicknamed the Fifth Avenue of Washington, D.C. After the business was moved a few blocks north in 1927, the Demonet family continued to own the building. It was rented to various retailers. The family sold the building in 1979. Since the modern addition was constructed, several organizations have owned the property, the most recent being an affiliate of the Qatari royal family.

The Cathedral of St. Matthew the Apostle in Washington, D.C., most commonly known as St. Matthew's Cathedral, is the seat of the Archbishop of the Roman Catholic Archdiocese of Washington. As St. Matthew's Cathedral and Rectory, it has been listed on the National Register of Historic Places since 1974.The cathedral is in downtown Washington at 1725 Rhode Island Avenue NW between Connecticut Avenue and 17th Street. The closest Metrorail station is Farragut North, on the Red Line. It is seven blocks north and two blocks west of the White House.

The Elizabeth Arden Building is an historic building, located at 1147 Connecticut Avenue, Northwest, Washington, D.C., in downtown Washington, D.C.

The Elliott Coues House is a historic house at 1726 N Street NW, in the Dupont Circle neighborhood of Washington, D.C. Built about 1880, it was the home of 19th-century historian and ornithologist Elliott Coues (1842–99) from about 1887 until his death. Coues helped found the American Ornithologists' Union in 1883 and edited about 15 volumes of journals, memoirs, and diaries by famous Western explorers and fur traders. The house was declared a National Historic Landmark in 1975.

Doctor John Witherspoon is a bronze sculpture and granite pedestal which depicts John Witherspoon, a Presbyterian minister, member of Congress, and signer of the Declaration of Independence. Born in Scotland, Witherspoon immigrated to the U.S. in the 1760s and later became president of the College of New Jersey (now known as Princeton University). He strongly supported the Thirteen Colonies in their fight to obtain freedom from the United Kingdom of Great Britain and Ireland. Witherspoon served in the Second Continental Congress and, after the American Revolutionary War ended, in the U.S. Congress. He was the only reverend who served in Congress at that time. In 1792, Witherspoon lost his eye sight after an infection and died two years later. It wasn't until over 100 years later that plans were made to erect a statue of Witherspoon in Washington, D.C. Members of the Church of the Covenant (now known as National Presbyterian Church) and other Presbyterians formed the Witherspoon Memorial Association in 1907. After raising enough funds for the memorial, they lobbied members of Congress for permission to erect the memorial on public land. The joint resolution passed in 1908. By that time, sculptor William CouperJ had begun working on the statue. The following year the memorial was dedicated. Prominent attendees at the event included future president Woodrow Wilson, Vice President James S. Sherman, former Secretary of State John W. Foster, and British Ambassador James Bryce, 1st Viscount Bryce. The memorial is located at the intersection of 18th Street NW, Connecticut Avenue, and N Street NW, in the Dupont Circle neighborhood. The statue is bronze and depicts Witherspoon holding a Bible. On one of the memorial's pedestal is a quote from Witherspoon. When the Church of the Covenant was razed in 1966, church members wanted the statue moved to its new location, but the government denied their request. The memorial is one of 14 American Revolution Statuary collectively listed on the National Register of Historic Places and the District of Columbia Inventory of Historic Sites. The memorial is also a contributing property to the Dupont Circle Historic District and the L'Enfant Plan.

The Philanthropy Roundtable is a nonprofit organization that advises conservative philanthropists.