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David Hallisey started their work experience in 2002 as a Senior Accountant at Hillshire Brands. David worked there until 2007 when they joined Ameren as a Senior Financial Specialist, where they stayed until 2018. In 2018, they joined Avadel Pharmaceuticals plc as a Senior Accountant.

David Hallisey obtained a Bachelor of Science degree with a major in Accounting from Webster University, where they attended from 1999 to 2001. Subsequently, they pursued a Master of Business Administration (MBA) at Webster University from 2003 to 2005.