Education Upon returning to Washington, D.C. in 1855, Cook became the head of Union Seminary, replacing his late father. Cook led Union Seminary until 1857 when his younger brother, George, succeeded him. Returning to D.C. in 1862, Cook recognized a shortage of schools in D.C. as a result of the increased population during the
Civil War. He erected a school for black children and named it after his father, the late John F. Cook. A lifelong educator like his father, Cook was also on the board of trustees and executive committee for
Howard University (1875-1910) and served on the District's Board of Education (1906-1910).
Politics and public service Following the closure of Union Seminary, Cook entered local government—and local politics soon after. In 1867, he began a clerkship in the office of the District tax collector. He would later be appointed by President
Ulysses S. Grant to be D.C.'s chief tax collector, serving for ten years from 1874 to 1884. In 1868, Cook was elected to the Board of Aldermen in the second elections in which black residents could vote. In 1869, Cook was appointed as a
Justice of the Peace and served as such until 1876. In 1868, Cook began to get involved in local Republican politics, utilizing his wealth and connections to gain influence. Cook served as the District's delegate to the Republican National Convention in 1872 and 1880. Cook was also appointed to be D.C.'s Jury Commissioner in 1889 and was a member of the Board of Children's Guardians from 1892 to his death in 1910.
Political activism Cook's social and political activism and influence was not limited to his work within government; he was a committed community organizer and activist in the black community and beyond. Cook was a trustee for many cultural and philanthropic institutions throughout his adult life, including the
Frederick Douglass Memorial and Historical Association, the Home for Destitute Women and Children, and the Coleridge-Taylor Musical Society, among others. However, Cook was wary about "taking the responsibility of answering the President on a matter in which more than four million of his people were concerned." The delegation included Cook, Benjamin McCoy, John T. Costin, Cornelius Clark, and chaired by Edward Thomas. Cook, Thomas and Clark were SCSA members. Cook was one of the leaders of the First Ward Civil Rights Association, and he helped to get a petition signed by 2,500 citizens and into Congress to be debated, which pushed for democratic representation and the boycotting of many segregated white establishments. Cook was also a vocal critic of Jim Crow laws and used his political influence to stifle their presence in D.C. Despite these concerns, Cook presided over a July 4 parade that many freed blacks attended, celebrating the Emancipation Proclamation, the Union Army's victory, and the passing of the 13th Amendment.
Freemasonry John F. Cook Jr. was very active in African American Freemasonry (also known as Prince Hall Affiliation) in Washington, DC. Cook was made a Freemason in Eureka Lodge #5. After serving as Worshipful Master of his lodge he was eventually elected Grand Secretary and then Grand Master of what was then known as the Union Grand Lodge (Now known as the Most Worshipful Prince Hall Grand Lodge of the District of Columbia) in 1866. John F. Cook Jr. would be the longest serving Grand Master in his masonic jurisdictions history. In 1871, John F. Cook Jr. oversaw the severance of ties between his Grand Lodge and the National Grand Lodge (Compact). John F. Cook Lodge #10 in Washington, DC is named in his honor. == Personal life ==