Olmo Hybrid: From Theory to Practice and Back

TTIC and William Merrill's homepage describe him as currently at the Allen Institute for AI and incoming to TTIC in Fall 2026 after a PhD from New York University. Public profile pages describe research spanning transformer expressivity, formal language theory, computational linguistics, and language models.

Yanhong Li is a pre-doctoral researcher at the Allen Institute for AI working on data-efficient pretraining, language model efficiency, and hybrid model theory.

Groundlight AI lists Tyler Romero as Lead ML Engineer. Public sources also list him as a coauthor of OLMo 3.

Anej Svete is a PhD Fellow at the ETH AI Center. His homepage says he studies language models with formal language theory and completed a 9-month research internship at Ai2 in 2025.

Public sources identify Caia Costello as a Stanford computer science MS student and quote her in 2026 as an Applied ML Researcher at Lambda; she is also a coauthor of OLMo Hybrid.

Pradeep Dasigi is a research scientist on the AllenNLP team at Ai2. His homepage says he has been actively involved in OLMo and Tulu and currently focuses on post-training language models.

Public sources identify Dirk Groeneveld as an OLMo 3 coauthor; a 2022 USC ISI speaker bio described him as a principal engineer at AI2 and technical lead for the AllenNLP Platform team.

David Heineman works on the OLMo project at Ai2 and says he previously completed his undergraduate studies at Georgia Tech.

Ai2's public team directory lists Bailey Kuehl, and recent public papers credit Kuehl on OLMo Hybrid and scientific-literature work.

Nathan Lambert's homepage says he is the post-training lead at Ai2, where he works on open language models and responsible autonomous systems. His public CV lists a PhD in Computer Science from UC Berkeley.

Kyle Lo's public homepage says he formerly served as a research scientist at the Allen Institute for AI, where he co-led OLMo. It describes current work on large-scale pretraining, data mixing, benchmark validity, and research-supporting data and software artifacts.

Saumya Malik is a predoctoral young investigator at the Allen Institute for Artificial Intelligence working on open language modeling, reward models, and instruction following.

This pass only confirmed DJ Matusz as a named author on the OLMo Hybrid report and Lambda's MFU optimization white paper.

Benjamin Minixhofer is a third-year PhD student at the University of Cambridge's Language Technology Lab. His homepage focuses on resource-efficient language models, modularity, and adaptive tokenization, and notes prior research experience at Ai2.

Jacob Morrison's homepage says he is a PhD student at UW and a student researcher on the AllenNLP team at Ai2, where he mainly works on language modeling.

Lead research scientist at Ai2 and a founding member of the OLMo team. He works on open language models, language agents, evaluation, and reasoning, and helps build open-model research infrastructure.

Finbarr Timbers is an AI researcher and investor. His homepage says he works at Ai2 on RL for LLMs and previously worked at Midjourney and DeepMind.

OpenReview lists Evan Pete Walsh as a researcher at the Allen Institute for Artificial Intelligence, and recent public reports credit Pete Walsh on OLMo Hybrid and related open-model work.

Noah A. Smith is the University of Washington's inaugural Vice Provost for Artificial Intelligence and a professor in the Paul G. Allen School of Computer Science & Engineering. He is also Senior Director of NLP Research at the Allen Institute for AI.

Hannaneh Hajishirzi is Senior Director at Ai2 and a professor of computer science at the University of Washington. Her public materials focus on generative AI, reasoning, open language models, pre-training, and evaluation.

Ashish Sabharwal is publicly listed as Principal Researcher at the Allen Institute for AI. Public sources also list him as a coauthor of the OLMo 3 technical report.

Canonical link

William Merrill

Yanhong Li

Tyler Romero

Anej Svete

Caia Costello

Pradeep Dasigi

Dirk Groeneveld

David Heineman

Bailey Kuehl

Nathan Lambert

Kyle Lo

Saumya Malik

DJ Matusz

Benjamin Minixhofer

Jacob Morrison

Luca Soldaini

Finbarr Timbers

Pete Walsh

Noah A. Smith

Hannaneh Hajishirzi

Ashish Sabharwal