Son of Daniel Dewey, a judge on the Massachusetts Supreme Judicial Court, and later a Congressman from Williamstown, and Maria Noble.
Graduated Williams College in 1811. After graduation he studied law and was admitted to the bar in 1814. Practiced primarily in Berkshire County, MA & Bennington County, VT. He remained in Williamstown for 11 years before moving to Northampton to practice law with his brother-in-law, Isaac C Bates. In 1823 and in 1825, he was elected to the Mass. House of Representatives and in 1830 to the Mass. Senate. From 1830 to 1837, served as the District Attorney Western District
He served as U. S. district attorney from 1830 till 1837, when he was appointed the fifth judge of the Supreme Court of Massachusetts.
Although not a brilliant lawyer, he was distinguished by the sound sense exercised in the consideration of all questions coming before him. He was thoroughly familiar with the entire body of statute law, as well as with that regulating mercantile transactions and charitable trusts, which latter received a large share of his attention at the beginning of his judicial career.
Charles Augustus Dewey was born in Williamstown, Massachusetts, March 13, 1793., one of the justices of the Supreme Judicial Court of Massachusetts, and served one term in Congress. His mother, Maria (Noble) Dewey, was the daughter of Honorable David Nobel, judge of the Court of Common Pleas. 
He attended Lenox Academy, and at the age of fourteen enetered Williams College, and graduated in the year 1811. At the age of majority, his father dieds, his mother having died two years previously. He was thus left te eldest of four children.
In 1814, he was admitted to the bar and continued to practice law in his native town. He moved to Northhampton in 1826 and here entered into a partnership with his brother-in-law, Hon. Isaac C. Bates, afterwards United States Senator.
He was appointed District Attorney in 1830 until he as appointed Judge in 1837. He took his seat on the Bench of the Supreme Court of Massachustte, June 24, 1837 and served for nearly 30 years until his death.
He married in 1821 Frances Henshaw, the daughter of Judge Samuel Henshaw of Northhampton. She died one year after their marriage, leaving a son, Francis Henshaw Dewey. He then married Caroline Hannah Clinton of Newburgh, New York. She was the daughter of General James Clinton, an officer of the Revolutionary Army, and of Mary (Little) Clinton, his second wife, a native of Longford, Ireland (her first husband was Alexander Gray. Mrs. Dewey was a half-sister of the well-known Governor DeWiii Clinton of New York. She died May 21, 1864.
Judge Dewey died at Northampton, August 22, 1866.
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