High Quality Content by WIKIPEDIA articles! Odyssey The Essential School is a public high school in SeaTac, Washington. It is one of three small schools at the Tyee Educational Complex, along with the Academy of Citizenship and Empowerment and Global Connections High School. It was founded in 2005 when Tyee High School converted into these three schools, and accredited individually in 2006. It is operated by the Highline School District.