Professor Holger Thesleff passed away on October 3, 2023. He was one of the leading researchers in ancient philosophy and Greek philology in Finland.

Holger Thesleff was elected member of the Finnish Society of Sciences and Letters in 1963 and honorary member in 2013. During the years 1960–1963 he served as notary of the Society, 1969–1979 as librarian and 1979–1980 as permanent secretary.

The Finnish Society of Sciences and Letters honours the memory of its honorary member.