President pro tempore of the California State Senate

President pro tempore of the California State Senate
Seal of the Senate of the State of California
California State Flag
Incumbent Mike McGuire since February 5, 2024
Member of	California State Senate
Term length	2 years
Inaugural holder	E. Kirby Chamberlain
Formation	1849
Unofficial names	President Pro Tem

The president pro tempore of the California State Senate (President Pro Tem) is the chief executive and highest-ranking member the California State Senate and serves as chair of the Senate Rules Committee. The Pro Tem is chosen at the beginning of each two-year session, via election by all the other senators-elect.^[1]

The current President pro tempore is Mike McGuire, a Democratic member from the 2nd district, who was sworn in on February 5, 2024.^[2]

The President pro tempore acts as the chair of the Senate while the President, the Lieutenant Governor of California, is absent during meetings, having the same powers of the president.^[3] If the President Pro Tempore is absent, another Senator appointed by the President pro tempore can act as chair.^[4] The President pro tempore has a responsibility to "secure the prompt and businesslike disposition of bills and other business before the Senate."^[5]

No.	President pro tempore		Political party		District	Term start	Term end
1		E. Kirby Chamberlain (1805–1852)		Nonpartisan[a]	Los Angeles–San Diego[a]	December 15, 1849	January 9, 1851
2		Elcan Heydenfeldt (1821–1898)		Whig	6th–San Francisco	January 9, 1851	January 8, 1852
3		Benjamin F. Keene (1813–1856)		Democratic	12th–Placerville	January 8, 1852	January 2, 1854
					18th–Placerville[b]
4		Royal Sprague (1814–1872)		Democratic	13th–Shasta	January 1, 1855	May 7, 1855
5		Delos R. Ashley (1828–1873)		American	3rd–San Francisco	January 9, 1856	April 21, 1856
6		Samuel H. Dosh (1827–1861)		Democratic	13th–Shasta	January 5, 1857	April 29, 1857
7		Samuel A. Merritt (1827–1910)		Democratic	10th–Shasta	January 4, 1858	April 26, 1858
8		W. B. Dickinson (????–????)		Democratic	5th–Sacramento	January 3, 1859	April 19, 1859
9		Isaac N. Quinn (1795–1865)		Democratic	7th–San Rafael	January 2, 1860	January 19, 1860
10		Charles J. Lansing (????–1884)		Democratic	16th–Stockton	January 19, 1860	April 13, 1860
11		Richard Irwin (1828–1869)		Union Democratic	26th–Quincy	January 7, 1861	May 20, 1861
12		James M. Shafter (1816–1892)		Republican	24th–San Francisco	January 6, 1862	May 15, 1862
13		Addison M. Crane (1814–1889)		Union	9th–Squatterville	December 7, 1863	April 4, 1864
14		Ransom Burnell (1821–1880)		Union	14th–St. Helena	April 4, 1864	December 4, 1865
15		S. P. Wright (????–1874)		Union	27th–Santa Barbara	December 4, 1865	April 2, 1866
16		Lansing B. Mizner (1825–1893)		Union	25th–Tehama	December 2, 1867	March 30, 1868
17		Edward J. Lewis (1832–1881)		Democratic	17th–Yountville	December 6, 1869	April 1, 1872
18		James T. Farley (1829–1886)		Democratic	16th–Volcano	December 1, 1873	March 13, 1874
19		William Irwin (1827–1886)		Democratic	28th–San Francisco	March 13, 1874	February 27, 1875
20		Benjamin F. Tuttle (1825–1907)		Democratic	21st–San Francisco	February 27, 1875	April 3, 1876
21		Edward J. Lewis (1832–1881)		Democratic	25th–Tehama	December 3, 1877	April 16, 1880
22		George F. Baker (1849–1882)		Republican	7th–San Jose	April 16, 1880	January 3, 1881
23		William Johnson (1829–1905)		Republican	18th–Courtland	January 3, 1881	April 1, 1882
24		R. F. del Valle (1854–1938)		Democratic	2nd–Los Angeles	April 1, 1882	March 13, 1883
25		Benjamin Knight (1836–1905)		Democratic	6th–Santa Cruz	January 5, 1885	March 12, 1887
26		Stephen M. White (1853–1901)		Democratic	38th–Los Angeles	January 3, 1887	March 16, 1889
27		Thomas Fraser (1831–1902)		Republican	7th–Placerville	January 5, 1891	March 25, 1891
28		R. B. Carpenter (1831–1909)		Republican	33rd–Los Angeles	January 2, 1893	March 14, 1893
29		Thomas Flint Jr. (1857–1936)		Republican	33rd–Hollister	January 7, 1895	March 14, 1903
30		Edward I. Wolfe (1860–1920)		Republican	21st–San Francisco	January 2, 1905	March 24, 1909
31		Albert E. Boynton (1875–1945)		Republican	6th–Oroville	January 2, 1911	May 12, 1913
32		Newton W. Thompson (1865–1936)		Republican	35th–Alhambra	January 4, 1915	January 11, 1916
33		Arthur H. Breed Sr. (1865–1953)		Republican	15th–Oakland	January 8, 1917	July 26, 1933
					16th–Oakland[b]
34		William P. Rich (1880–1965)		Republican	10th–Marysville	January 7, 1935	June 20, 1939
35		Jerrold L. Seawell (1897–1952)		Republican	7th–Roseville	January 2, 1939	June 14, 1941
36		William P. Rich (1880–1965)		Republican	10th–Marysville	January 6, 1941	January 4, 1943
37		Jerrold L. Seawell (1897–1952)		Republican	7th–Roseville	January 4, 1943	June 16, 1945
38		Harold J. Powers (1900–1996)		Republican	31st–Cedarville	January 6, 1947	October 5, 1953
39		Clarence C. Ward (1894–1955)		Republican	31st–Santa Barbara	March 1, 1954	May 9, 1955
40		Ben Hulse (1894–1961)		Republican	39th–Imperial	January 3, 1955	April 5, 1956
41		Hugh M. Burns (1902–1988)		Democratic	30th–Fresno	January 5, 1957	May 14, 1969
					16th–Fresno[b]
42		Howard Way (1913–2001)		Republican	15th– Exeter	May 14, 1969	February 10, 1970
43		Jack Schrade (1902–1992)		Republican	39th–El Cajon	February 10, 1970	November 30, 1970
44		James R. Mills (1927–2021)		Democratic	40th–San Diego	November 30, 1970	November 30, 1980
45		David Roberti (born 1939)		Democratic	23rd–Los Angeles	November 30, 1980	January 31, 1994
46		Bill Lockyer (born 1941)		Democratic	10th–Oakland	January 31, 1994	February 5, 1998
47		John Burton (born 1932)		Democratic	3rd–San Francisco	February 5, 1998	November 30, 2004
48		Don Perata (born 1945)		Democratic	9th–Alameda	November 30, 2004	August 21, 2008
49		Darrell Steinberg (born 1959)		Democratic	6th–Sacramento	August 21, 2008	October 15, 2014
50		Kevin de León (born 1966)		Democratic	24th–Los Angeles	October 15, 2014	March 21, 2018
51		Toni Atkins (born 1962)		Democratic	39th–San Diego	March 21, 2018	February 5, 2024
52		Mike McGuire (born 1979)		Democratic	2nd–Healdsburg	February 5, 2024	Incumbent

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