[1] Collier began her professional career as an intern at MCB Environmental Engineers, Inc. She worked there for nineteen years before becoming Executive Director of Pennsylvania's 21st Century Environment Commission and regional director of the Pennsylvania Department of Environmental Protection Southeast Region.
[3] Today, Collier is the Director of the Environmental Studies and Sustainability Program and the Senior Advisor on Watershed Management and Policy at the Academy of Natural Sciences, both at Drexel University.
[1] In the latter role, she is primarily responsible informing government agencies about how the management initiative is valuable and relevant to their programs.
She is published on the subjects of the environment and water and has provided testimony to the House of Representatives and the Pennsylvania Legislature.
She is a licensed planner in the state of New Jersey and has been part of international water management projects in the People's Republic of China and in Ecuador.