Seth was born and raised in Bristol, Rhode Island, and began his career as a public elementary school teacher in rural Louisiana during the aftermath of Hurricane Katrina. After returning home to Rhode Island, Seth worked as a vice president at Trillium Asset Management, a socially responsible investment firm based in Boston, MA.
In his first months in office, Seth successfully championed legislation establishing new green infrastructure programs at the Rhode Island Infrastructure Bank. These programs are putting tradesmen and women to work on energy efficiency and renewable energy projects across the state, helping Rhode Islanders save on energy costs while reducing the state’s carbon footprint.
In May of 2015, Seth launched his "Transparent Treasury" initiative to help Rhode Islanders access information about how their public funds are managed. Among other features, the initiative includes a new investment policy stating that Rhode Island will only invest with fund managers that agree to full public disclosure of performance and fees, and a new online investment information center where all Rhode Islanders can see how their funds are invested. In 2017, his "Transparent Treasury" initiative was codified into law by the Rhode Island General Assembly.
Seth also worked with a bipartisan group of legislators to design and pass the 2015 ABLE Act, which will establish tax-efficient savings accounts for the families of disabled children.
Treasurer Magaziner also launched ‘BankLocal’, Rhode Island Treasury’s community deposit program which earmarks up to $30 million in state deposits to local banks and credit unions. The goal of the program is to support local financial institutions as they lend to small businesses in Rhode Island, supporting economic growth and opportunity in the Ocean State.
Seth serves on the board of directors at Crossroads Rhode Island, which works to help homeless or at-risk individuals and families secure stable homes. He previously served on the board of Common Cause Rhode Island, Serve Rhode Island, Marriage Equality Rhode Island, and the Bristol 4th of July Committee.
Seth and his wife live in Providence. He holds a bachelor’s degree in history from Brown University and a master’s degree in business administration from Yale University.