Mariann Bienz, Lady Pelham, FRS, FMedSci, is a Swiss-British molecular biologist based at the UK Medical Research Council Laboratory of Molecular Biology. She has been a member of their Senior Scientific Staff since 1991, was Joint-head of Cell Biology in 2007-08 and has been a Group Leader of Protein and Nucleic Acid Chemistry Division since 2008.
Mariann Horváth is a Hungarian épée fencer, twice individual world champion and four-time team world champion.Horváth was one of the first women épée champions after the event was introduced by the International Fencing Federation at the 1988 World Fencing Championships.