Seth Preston Beers (1781-1863) was the first child of Josiah Beers and Elizabeth Preston Beers. He was born on July 1, 1781 in Woodbury, Connecticut. Beers attended the Litchfield Law School in 1803 and was admitted to the bar in 1805. His brother Frederick attended the Litchfield Law School in 1809.

Besides his legal profession, Beers pursued an active political career within the state. From 1820 to 1825, he served as the state's attorney. From 1820 to 1823, Beers was a member of the Connecticut State House of Representatives where he served as the clerk in 1821 and as the speaker of the house in 1823. After a term in the Connecticut Senate in 1824, Beers spent the next twenty-five years as the commissioner of the Connecticut School Fund.

In May 1824, the Connecticut General Assembly appointed Beers, along with his colleagues Thomas Day and Lemuel Whitman (both attorneys) to a committee whose purpose was to reprint the revised statutes of the state. They were given the power to edit for errors in the previous 1821 edition, update any changes to the laws, and improve the index. It was published November 1824.

Outside of politics, government, Beers was director of the Litchfield Savings Bank and the Phoenix Bank, director of Walcott School for Boys, and a trustee of the Litchfield Female Academy. He was the first president of the Litchfield County Historical and Antiquarian Society, the predecessor to the Litchfield Historical Society.

On September 23, 1807, Beers married Belinda Webster of Litchfield, Connecticut. The couple had five children, two of whom attended the Litchfield Female Academy: Julia Maria Beers and Horatio Preston Beers, who died at the age of 14. Beers died in Litchfield on September 9, 1863.