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Hi! I’m Constanza 👋🏼
I’m a DDSA Postdoc and MATS fellow. I received my PhD from the University of Copenhagen, supervised by Anders Søgaard. During my PhD I was lucky to collaborate with Anthropic Alignment Science team, and do internships at Google DeepMind in the language understanding team, and at Apple in the Siri Understanding team. Before starting my PhD, I worked as a Software Engineer at Google, scaling ML classifiers development at Youtube (based in Paris). Previous to that, I completed my engineering degree in Computer Science at the University of Chile.
I’m generally interested in knowledge representations and reasoning, multilinguality, and interpretability to build more trustworthy models. I also enjoy learning about psychology, philosophy and cognitive sciences. Non work related, I really enjoy running, hiking, cooking, taking photos, and exploring new places.
Selected publications
Steering Language Models with Weight Arithmetic
Constanza Fierro, Fabien Roger
ICLR, 2026.
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Israfel Salazar, Stella Frank, Dan Oneata, Desmond Elliott, Constanza Fierro
NeurIPS, 2026.
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Constanza Fierro, Negar Foroutan, Desmond Elliott, Anders Søgaard
Findings of ACL, 2025.
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Constanza Fierro, Ruchira Dhar, Filippos Stamatiou, Nicolas Garneau, Anders Søgaard
EMNLP, 2024.
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Constanza Fierro, Reinald Kim Amplayo, Fantine Huot, Nicola De Cao, Joshua Maynez, Shashi Narayan, Mirella Lapata
ACL, 2024.
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Constanza Fierro, Nicolas Garneau, Emanuele Bugliarello, Yova Kementchedjhieva, Anders Søgaard
NAACL, 2024.
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