• Chair Professor (Changjiang Scholar) — Xi’an University of Science and Technology, China (2025–present)

• Distinguished Visiting Professor — University of Johannesburg, South Africa (2020–present)

• Extraordinary Professor — University of Pretoria, South Africa (2023–present)

• Professor Extraordinarius — University of South Africa (UNISA), South Africa (2025–present)

• Visiting Research Professor — Gulf University for Science and Technology, Kuwait (2024–present)

• Visiting Professor — University of Novi Sad, Serbia (2021–present) & Chandigarh University, India (2022–present)

• Adjunct Professor — University of Jyväskylä, Finland (2008–present)

• Professor of Green Chemistry / Environmental Engineering — LUT University, Finland (2010–2019)

• Professor — Aarhus University, Denmark (2021–2023) & University of Electronic Science and Technology of China (UESTC), China (2020–2023)

• Professor — King Saud University, Saudi Arabia (2021–2022)

• Courtesy / Visiting Professor — Florida International University, USA (2015–2018)

• Professor of Applied Environmental Chemistry — University of Eastern Finland / University of Kuopio, Finland (2003–2010)

• Professor of Chemical Water Treatment — University of Oulu, Finland (2000–2003)

Professor Sillanpää has collaborated with over 200 research partners across six continents and has conducted research visits across Europe, Asia, Africa, North and South America, Australia, and the Pacific Islands. He has supervised 71 Ph.D. dissertations, 9 Licentiate theses, and over 100 M.Sc. and B.Sc. theses, alongside collaborating on R&D with more than 80 industrial companies worldwide.