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David Kellner has a solid work experience in the finance field. David started their career at Test Technology Associates in 2000 as an Accounting Clerk and worked there until 2002. In 2003, they joined Cyn Environmental Services as a Purchaser and later became an Assistant Controller in 2006. David then worked as a Financial Controller from 2010 till 2019 at the same company. In 2019, David joined Clean Harbors as the Director of Commercial Operations. David then progressed to become the Senior Finance Director in 2021, followed by the Vice President of Finance in 2022, and finally Senior Vice President of Finance in 2024, which is their current position.

David Kellner holds a Bachelor's degree in Accounting and Business/Management from Curry College. Additionally, they have a degree in Business Management with a focus on Accounting and Business/Management from Curry College.