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Christian Käser has a diverse work experience, starting in 2016 as a Hilfsassistent at ETH Zürich, where they assisted in lecturing on Siedlungswasserwirtschaft and Hydrologie. In 2017, they worked as a Praktikant at HOLINGER AG, gaining experience in Siedlungswasserbau and Siedlungsentwässerung. In 2018, they interned at Waldburger Ingenieure AG, focusing on Wasserversorgung. Christian then joined Amstein + Walthert as a Junior Consultant GIS from 2018 to 2020. From there, they became a Sustainability Consultant Intern at Quantis before taking on the role of a full-time Sustainability Consultant in 2021. In September 2020, Christian became the Co-Founder and CEO of bottleplus, a company specializing in sparkling water.

Christian Käser received a Bachelor's degree in Umweltingenieurwissenschaften from ETH Zürich in 2017. Christian then pursued a Master's degree in the same field at ETH Zürich from 2018 to 2020.