Soheyl Sazedj is experienced in rehabilitation of old buildings since 1992. He had several rehabilitation projects in the city center of Vienna, Austria. He based his rehabilitation projects on low energy consumption during life cycle and proved the success of the projects during a 5-year observance. Later, he dedicated himself to sustainable construction and masonry. He was involved in the rehabilitation of some heritage buildings as palaces and churches in Portugal where he established his main line of research in sustainable rehabilitation of old buildings. He wrote his PhD thesis about “Analysis of Sustainability of Structural Masonry”. He was an invited assistant professor at the Faculty of Architecture of the University of Lisbon from 2010 to 2022 when he retired from university work but continued his research being a permanent member of the CIAUD Center for Investigation of Architecture, Urbanism and Design of FAUL. He is at the moment supervising a doctorate student. He has published his findings in international and national peer reviewed conferences, as book chapters from Springer and finally in the journal Construction and Building Materials of Elsevier. His main research projects are EFBUCO Environmental Friendly Building Construction and PHEB Protecting Heritage in Harsh Environment by Biopolymers. In 2013/2014, together with other colleagues and academic institutions, he installed a one-year postgraduate course for rehabilitation in the World Heritage City of Elvas. The heritage in Elvas is mainly military architecture and for this purpose the municipality of Elvas and the surrounding cities mainly promoted the course as well as the neighboring Spanish city of Badajoz. The 42 students were architects, engineers, historians, restaurateurs and economists of the municipalities. They studied the pathologies of several cases and developed rehabilitation solutions. He also collaborated with the internationally famous Hercules Laboratory of the University of Évora in cooperation with municipalities of the region for rehabilitation of old religious buildings during his work at the University of Evora from to 2010 to 2015 as invited assistant professor. He collaborates since 2018 with the German Aerospace Centre and the Renewable Energy Chair of the University of Evora for coordination, authorship and structural design of several construction projects of the Evora Molten Salt Platform, a research facility to generate electricity by using sun light and liquid salt as heat transfer medium and using CO2 for cost reducing. The facility consists of a 760 m parabolic trough collector loop and the necessary equipment to produce electricity. Despite this episode, he never discontinued his rehabilitation work and is until the present involved in rehabilitation projects of art deco, pombalino or similar buildings in Lisbon where his focus is to add value to the buildings regarding sustainability, environmental comfort, well being and affordability.