Question: When was the executive service branch created that was held by the seventh governor of the most densely populated state , who served in all 3 US branches ?

text: List of people who have served in all three branches of the United States federal government
List

Following is a list of persons who have served in all three branches of the United States federal government. Membership in this list is limited to persons who have:
Person Executive branch service Legislative branch service Judicial branch service
James L. Buckley Undersecretary of State for Security Assistance , 1981-1982 President of Radio Free Europe/Radio Liberty , 1982-1985 Senator , New York , 1971-1977 U.S . Circuit Judge , U.S. Court of Appeals for the D.C . Circuit , 1985-1996
James F. Byrnes Director , Office of Economic Stabilization , 1942-1943 Chairman , Office of War Mobilization , 1943-1945 Secretary of State , 1945-1947 Representative , South Carolina , 1911-1925 Senator , South Carolina , 1931-1941 Associate Justice of the Supreme Court of the United States , 1941-1942
Salmon P. Chase Secretary of the Treasury , 1861-1864 Senator , Ohio , 1849-1855 ; 1861 Chief Justice of the United States , 1864-1873
Henry De Lamar Clayton , Jr United States Attorney , Middle District of Alabama , 1893-1896 Representative , Alabama , 1897-1914 U.S. District Judge , U.S. District Court for the Northern District of Alabama and U.S. District Court for the Middle District of Alabama , 1914-1929
Nathan Clifford Attorney General , 1846-1848 Minister to Mexico , 1848-1849 Representative , Maine , 1839-1843 Associate Justice of the Supreme Court of the United States , 1858-1881
Alfred Conkling Minister to Mexico , 1852-1853 Representative , New York , 1821-1823 U.S. District Judge , U.S. District Court for the Northern District of New York , 1825-1852
J. Harry Covington Member , Railway Wage Commission , 1918-1920 Representative , Maryland , 1909-1914 U.S. District Judge , Supreme Court of the District of Columbia , 1914-1918
Mahlon Dickerson Secretary of the Navy , 1834-1838 Senator , New Jersey , 1817-1833 U.S. District Judge , U.S. District Court for the District of New Jersey , 1840-1841
Gabriel Duvall First Comptroller of the Treasury , 1802-1811 Representative , Maryland , 1794-1796 Associate Justice of the Supreme Court of the United States , 1811-1835
Powhatan Ellis Minister to Mexico , 1839-1842 Senator , Mississippi , 1825-1826 ; 1827-1832 U.S. District Judge , U.S. District Court for the District of Mississippi , 1832-1836
Walter Evans Commissioner of Internal Revenue , 1883-1885 Representative , Kentucky , 1895-1899 U.S. District Judge , U.S. District Court for the District of Kentucky , 1899-1901 U.S. District Judge , U.S. District Court for the Western District of Kentucky , 1901-1923
George P. Fisher United States Attorney , District of Columbia , 1870-1875 First Auditor of the Treasury Department , 1889-1893 Representative , Delaware , 1861-1863 U.S. District Judge , Supreme Court of the District of Columbia , 1863-1870
Nathan Goff Jr United States Attorney , District of West Virginia , 1868-1881 ; 1881-1882 Secretary of the Navy , 1881 Representative , West Virginia , 1883-1889 Senator , West Virginia , 1913-1919 U.S . Circuit Judge , U.S. Court of Appeals for the Fourth Circuit , 1892-1913
Nathan K. Hall Postmaster General , 1850-1852 Representative , New York , 1847-1849 U.S. District Judge , U.S. District Court for the Northern District of New York , 1852-1874
Guy T. Helvering Commissioner of Internal Revenue , 1933-1944 Representative , Kansas , 1913-1919 U.S. District Judge , U.S. District Court for the District of Kansas , 1943-1946
John J. Hickey United States Attorney , District of Wyoming , 1949-1953 Senator , Wyoming , 1961-1962 U.S . Circuit Judge , U.S. Court of Appeals for the Tenth Circuit , 1966-1970
David M. Key Postmaster General , 1877-1880 Senator , Tennessee , 1875-1877 U.S. District Judge , U.S. District Court for the Eastern District of Tennessee and U.S. District Court for the Middle District of Tennessee , 1880-1895
Lucius Quintus Cincinnatus Lamar II Secretary of the Interior , 1885-1888 Representative , Mississippi , 1857-1860 ; 1873-1877 Senator , Mississippi , 1877-1885 Associate Justice of the Supreme Court of the United States , 1888-1893
John Laurance Judge Advocate General , 1777-1782 Representative , New York , 1789-1793 Senator , New York , 1796-1800 U.S. District Court , U.S. District Court for the District of New York , 1794-1796
Oscar Raymond Luhring Assistant Attorney General for the Criminal Division , 1925-1930 Representative , Indiana , 1919-1923 U.S. District Judge , U.S. District Court for the District of Columbia , 1930-1944