In 1946, she met Treasury Secretary John Snyder as she was painting his daughter, Drucie. She went on to paint Snyder. President Harry S. Truman attended Snyder’s portrait unveiling and commissioned Kempton shortly afterwards. Kempton painted President Truman’s portrait in 1947, after five sittings with the president in the Cabinet Room of the West Wing. She also painted Truman’s daughter, Margaret.³

Several years later, she was asked to paint First Lady Bess Wallace Truman’s portrait. According to Kempton, it took the White House some time to track the artist down, after they initially could not determine her whereabouts.⁴ She completed Mrs. Truman’s portrait in 1952. Mrs. Truman enjoyed Kempton’s portrait so much that she took it with her when she left the White House. The original painting now hangs in the Music Room of the Truman Home at the Harry S. Truman National Historic Site located in Independence, Missouri.⁵

The portrait of President Truman remained in the White House Collection and is now considered his official portrait. After Kempton finished this piece, she began another which was eventually completed in 1970 and added to the National Portrait Gallery’s collection of presidential portraiture. However, because Mrs. Truman brought her portrait back to Missouri, she did not have an official White House portrait. In 1967, Kempton painted a copy of the original and it was added to the White House Collection as a gift of the White House Historical Association.⁶ The following year, First Lady “Lady Bird” Johnson hosted a White House ceremony for the hanging of the portrait. Kempton attended the unveiling along with former First Daughter, Margaret Truman.⁷

Kempton’s Truman portrait propelled her career forward. The likeness became the official campaign poster for the 1948 election, and it was later used on a 1983 postage stamp honoring Truman and a 1985 coin celebrating his hundredth birthday. Her painting of Truman also earned her commissions from a number of other prominent officials in his administration including Attorney General Thomas C. Clark, Postmaster General Jesse Donelson, and Secretary of the Interior Julius Krug. In 1949, she opened a one-woman exhibition at the Corcoran Gallery of Art in Washington, D.C.

In 1963, she was named a Fellow of the Royal Society of Arts in England. Kempton continued painting throughout the rest of her life, eventually settling in New York City. Although she was asked to consider painting portraits of President Dwight D. Eisenhower and President Lyndon B. Johnson, she declined out a sense of devotion to the Truman family. In 1987, the Harry S. Truman Presidential Library and Museum hosted an exhibition of her works titled, “Greta Kempton: 40 Years on Canvas.” Greta Kempton passed away on December 10, 1991. As a testament to her close relationship with the Trumans, Kempton donated the bulk of her estate, including her private art collection, to the Truman Library in Independence.⁸