1926 – Born on the 12th of March in Honolulu, Hawaii.
1944 – Graduated from McKinley High School.
1949 – Upon returning stateside, he first attended the University of Hawaii at Manoa, then transferred to Michigan State University, where he graduated with a Bachelor of Arts degree.
1954 – His political career began when he was elected to the territorial house of representatives.
1955 – Married Jean Hayashi Ariyoshi, in Honolulu, Hawaii.
1958 – He was later elected to the territorial senate.
1959 – Elected to the State Senate.
1970 – He served in the senate until when he ran for and was elected Lieutenant Governor of Hawaii with Governor John A. Burns.
1973 – When Governor Burns fell ill in October, he assumed his constitutional role as acting governor.
1974 – He was elected governor in his own right, with Nelson Doi as his lieutenant governor.
1974-1986 – He served as the third Governor of Hawaii.
1978 – He was re-elected with Jean King as lieutenant governor.
1986 – Barred by term limits from seeking another term, he was succeeded by Waihee.
2003 – He served five terms as chairman, until he was not reappointed by Republican Governor Linda Lingle.