Josef Kallo, the founder of H2FLY, a prominent company in hydrogen-electric aircraft propulsion, is stepping down as CEO to take on the role of chief technology officer. H2FLY has made significant strides in hydrogen propulsion, including the successful flight of its HY4 demonstrator aircraft using liquid hydrogen and developing fuel cell systems for Joby's eVTOL aircraft. The company was acquired by Joby Aviation in 2021, showcasing its industry relevance. Ralph Müller, an experienced professional from the automotive sector, will succeed Kallo as CEO, focusing on product development and certification. Kallo's transition to CTO emphasizes the company's dedication to advancing hydrogen technology through early-stage development and partnerships. Both Kallo and Müller express enthusiasm for H2FLY's mission of sustainable aviation and the prospects of hydrogen-electric propulsion. The leadership change reflects H2FLY's strategic shift towards market-ready hydrogen-electric systems, indicating a positive outlook for the company's future in the sustainable aviation industry.