Breton, Jules (1827-1906). French painter and writer. Breton is best known for his popular and widely-reproduced painting The Song of the Lark (1884). Thea Kronborg, the protagonist of Cather’s The Song of the Lark (1915), encounters the painting in the Art Institute of Chicago. Houghton Mifflin reproduced the painting on the dust jacket of the novel until Cather asked them to remove it in 1931.

Hambourg, Isabelle McClung (1877-1938). Cather’s longtime friend. Cather met Isabelle McClung, the daughter of a socially prominent, Pittsburgh (PA) family, in 1899 in the dressing room of actress Lizzie Hudson Collier. McClung seems to have been the first woman to reciprocate Cather’s romantic affections. In 1901, McClung invited Cather to live in her family’s large home in the Squirrel Hill neighborhood of Pittsburgh. She and Cather traveled together to Europe in 1902, and McClung accompanied Cather on a visit home to Nebraska in 1905. After Cather moved to New York City in 1906, she frequently visited McClung in Pittsburgh, finding the familiar house a congenial place to write, and McClung visited New York City, staying with Cather and Edith Lewis. Cather and McClung also rented a vacation cabin in Cherry Valley, NY, in 1911, and traveled together to Virginia in 1913. In late 1915, shortly after the death of her father, Judge Samuel McClung, Isabelle announced her intention to marry violinist Jan Hambourg. Cather reacted negatively to the marriage (which took place in 1916) but eventually reconciled herself to it, enjoying long visits with the Hambourgs in Toronto, Ontario, in 1921 and France in 1923 and 1935. Cather and Edith Lewis also spent time with the Hambourgs in Paris is 1930 and 1935. The latter trip occurred after Isabelle sought treatment in the U.S. for the kidney disease that killed her several years later in Italy. Her death came only four months after Cather’s brother Douglass died, leaving her feeling bereft. “No other living person cared as much about my work, through thirty-eight years,” she wrote her brother Roscoe (#2137). After Isabelle’s death, Jan sent to Cather the six hundred letters from Cather to Isabelle in his possession, and Cather destroyed them, although a few letters from Isabelle and Cather postcards to Isabelle are extant.

Knopf, Alfred A. (1892-1984). President of New York publisher Alfred A. Knopf, Inc. Knopf received his BA from Columbia University in New York City in 1912 and founded Alfred Knopf, Inc., in 1915 with his future wife Blanche Wolf. They married in 1916, and their son Alfred “Pat” Knopf was born in 1918. Cather chose him as her publisher beginning with Youth and the Bright Medusa (1920) and One of Ours (1922), partly because she was dissatisfied with the promotion of her books by Houghton Mifflin but also because she recognized the high quality of Knopf's books, as well as what she regarded as his intelligent advertising. Knopf was noted for publishing the work of leading European and South American writers in translation, as well as original works. Knopf and Cather’s extensive correspondence testifies to their mutual professional respect and to what also became an important personal friendship.

Knopf, Blanche Wolf (1894-1966). Vice President of New York publisher Alfred Knopf, Inc. Blanche Wolf founded Alfred Knopf, Inc., in 1915 with her future husband Alfred Knopf. They married in 1916 and their son Alfred “Pat” Knopf was born in 1918. Active in the business throughout her life, Blanche Knopf recruited a number of prominent European and Latin American writers to the Knopf list (in translation) by traveling to meet them. In recognition of her work with writers such as Jean-Paul Sartre and Albert Camus, she was inducted into the French Legion of Honor in 1949. She became president of Alfred Knopf, Inc., in 1957 when her husband became chairman. Through her work in the publishing house she also promoted writers of the Harlem Renaissance such as Langston Hughes. Cather’s letters to Knopf focus primarily on business but the two also became friends.