In 1939, he moved to New York City. The following year, he was elected by a wide margin to represent the 16th Congressional District[6] on the East Side of Manhattan in the 77th Congress, January 3, 1941 to January 3, 1943. Pheiffer was the first Republican to carry the district, defeating the Democraticincumbent, James Fay. He was defeated for reelection by Fay by 80 votes in 1942. The 16th District was merged with others in a 1944 reapportionment.
PresidentEisenhower appointed Pheiffer the Ambassador to the Dominican Republic[7] on May 28, 1953. His full title was Ambassador Extraordinary and Plenipotentiary and his presentation of credentials took place on June 29.
On March 20, 1954, he was married in the fashionable Everglades Club in Palm Beach, Florida, to Frances Margaret Laacke (September 30, 1892 – July 8, 1993) (She was first married to and divorced from physician Samuel G. Higgins; she then married and became the widow of Milwaukee brewer/real estate dealer George E. Uihlein).[8][9]
Pheiffer then returned with his bride to the Dominican Republic and they took up residence together at the U.S. Embassy in Ciudad Trujillo (now Santo Domingo).[10] He served at his post as envoy until June 2, 1957. He and his wife then returned to New York, where he carried on his practice of law. At his death, his law office was at 645 Madison Avenue.[11][12]
^1900 Chickasaw Nation, Indian Territory, U.S. Federal Census, Purcell, June 6 & 7, Enumeration Dist. 155, sht. 4 A, p. 96 A, line 28.
^1910 Carter Co., OK, U.S. Federal Census, Ardmore Ward 3, April 18 & 19, Enumeration Dist. 43, sht. 3 A, p. 96 A, line 17
^World War I Draft Registration Cards, September 12, 1918, Oklahoma City, OK, Serial No. 3637, Order No. 3431, Registrar's No. 35-3-28-C
^1920 Oklahoma Co., OK, U.S. Federal Census, Oklahoma City Ward 1, 800 W. 19th St., January 6, Enumeration Dist. 121, sht. 5 A, p. 183 A, line 11
^1930 Potter Co., TX, U.S. Federal Census, Amarillo, April 14, Enumeration Dist. 13, sht. 25 A, p. 54 A, line 7
^The New York Times, Nov 6, 1940, "City Margin Wide; Lead Totals 727,254-- Queens, Richmond Won by Willkie; P. R. System Upheld; Abolition Move Defeated by About 206,550-- Simpson is Elected. Roosevelt's Lead 727,254 In The City," p. 1
^The Los Angeles Times, May 22, 1953, from Washington, May 21 (UP), "Ambassador Choices Made," p. 7
^The New York Times, March 14, 1954, "W.T. Pheiffer To Wed; Envoy to Dominican Republic Will Marry Mrs. Uihlein," p. 97
^The New York Times, March 21, 1954, from Palm Beach, March 20 (UP), "W.T. Pheiffer Marries; Envoy to Dominican Republic Weds Mrs. Frances Uihlein," p. 91
^The Los Angeles Times, March 21, 1954, from Palm Beach, March 20 (UP), "U.S. Envoy to Dominican Republic Takes Bride," p. 24
^The New York Times, August 19, 1986, "William T. Pheiffer, Ex-Ambassador, 88," p. B6
^The Los Angeles Times, August 23, 1986, from Times Wire Services, "William T. Pheiffer; Ex-Envoy," p. E7