Marizeth did her Honors and Masters studies in Microbiology and Genetics at the University of Stellenbosch, South Africa. In 2007, she obtained her PhD in Phytopathology through Wageningen University, The Netherlands, in combination with the Plant Pathology group at the Westerdijk Institute (WI), previously known as CBS. Her passion and research focus on the fascinating world of yeasts started with her career in the CBS Culture Collection when she was appointed as the curator of the yeast collection. She has been serving in this role since 2009 with a focus on general collection management and quality control of the CBS yeast collection, preserving these important organisms for generations to come. Some of her additional tasks are: biosecurity officer, patent officer of the CBS secure collection, and a member of the WI management team.
Her main research focus is on the taxonomy and systematics of yeasts. She has (co-) authored numerous manuscripts describing various novelties at different taxonomic levels: species, genera, families, orders, and classes. She is a co-editor of the theyeasts.org, a valuable online resource on yeast taxonomy, systematics, and biodiversity that is a follow-up on The Yeasts: A Taxonomic Study book series. In 2015, she was invited by Clete to get involved in the Y1000+ Project by supplying quality-controlled strains from the CBS collection; after the unfortunate death of Clete in 2017, she started working directly with Chris and Antonis on this project as the lead taxonomic expert.
After earning a PhD from West Virginia University in 1967, Clete worked for 50 years for the United States Deparment of Agriculture in Peoria, IL, first as a Curator for the NRRL Culture Collection and finally as a Supervisory Microbiologist until his sudden death in 2017 (Obituary). He was an undeniable leader and nucleating force for the yeast biodiversity, systematics, and taxonomy community. Significant accomplishments include the introduction of DNA sequencing to yeast taxonomic practice, the formal description of many yeast species and genera, and co-editing 2 editions of The Yeasts: A Taxonomic Study, a multi-volume book on yeast taxonomy and biodiversity. Clete worked with Chris, Antonis, and Marizeth as a Co-PI on the Y1000+ Project until Marizeth stepped in as the taxonomic lead following his death.