After graduating with a Bachelor's Degree in Management and Human Resource Management from Colorado Mesa University in 2011, Cassidee was hired in 2012 as the executive director of Colorado Association for Viticulture & Enology (CAVE), the only non-profit dedicated to the winemakers and grape growers in the state. Since then, she has restructured the organization into one of the premier wine-related associations in the USA. As the director of CAVE, Shull is responsible for organizing their regional trade conference, VinCO, as well as Colorado Mountain Winefest, the largest fundraiser for CAVE. Mountain Winefest has received national acclaim, being named the Best Wine Festival in the Nation by USA Today as well as receiving the Outstanding Community Tourism Initiative Award from the Colorado Governor's Tourism Conference. Each year, Colorado Mountain Winefest brings in attendees from all over the world, as well as over one million dollars of economic revenue to the Grand Valley.

Shull is active on many boards and committees including the Palisade Tourism Advisory Board, the Colorado Wine Industry Development Board, the Western Colorado Horticultural Society Board, and the Colorado Tourism Destination Development Advisory Board. She received the inaugural Young Alumni Who’s Who award from Colorado Mesa University in 2018 and was participant in the Colorado Tourism Office Leadership Journey Class of 2019.

Outside of work, she enjoys supporting live music, D&D and spending time with her one-eyed Cavalier King Charles Spaniel, Ruca – all over a glass of Colorado wine!