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Tammy O'Sullivan has had work experience in various roles and companies. Tammy began their career in 2003 as a Manager at ABSU, where they worked until 2007. In the same year, they joined Accenture Business Services for Utilities as an IT Manager and stayed there until 2007. In 2007, they also started working at Hydro One, initially as a Project Coordinator and later progressing to roles such as Process Management & Special Projects Manager, Manager of Program Integration, Director of Mergers & Acquisitions, and currently holds the position of Director of Distribution Operations Management.

From 1990 to 1994, Tammy O'Sullivan attended York University, where they earned a Bachelor of Science (BSc.) degree in Biology.