
Research Scientist at Databricks AI Research
PhD, University of Waterloo. Apple PhD Fellow.
Hi! I am a Research Scientist at Databricks AI Research working on synthetic data and reinforcement learning for post-training information-seeking agents. I completed my PhD in the David R. Cheriton School of Computer Science at the University of Waterloo, where I was advised by Jimmy Lin. I have also had the chance to work at Google, Apple, and Yupp AI.
Previously, I completed my undergraduate studies at the University of Waterloo, where I majored in Computer Science and Combinatorics and Optimization. During my undergrad, I've had the chance to intern at Quebec Artificial Intelligence Institute (Mila), ContextLogic, and RBC Research.

I work on knowledge agents: systems that search, read, and reason over large collections of structured and unstructured data to answer hard questions. I approach this from both the data side and the model side, through data environments and reinforcement learning. I have also worked extensively on evaluation, including nugget-based assessment of RAG, LLM judges, and community-wide benchmarks such as the TREC RAG Track. These threads are connected, because better evaluation leads directly to better rewards.
Life update: I joined Databricks AI Research!
Two papers accepted at SIGIR 2026: Auto-Judge, a benchmark for LLM judges in citation-grounded RAG, and automating long-form query generation!
The overview of the TREC 2025 RAG Track is out! We are running the track again in 2026.
We have five papers accepted at SIGIR 2025! See you all in Padova!
We had a successful first year of the TREC RAG 2024 Track with many submissions! Looking forward to Y2.
Organizing the TREC RAG 2024 Track! Do submit your systems :))
We introduced RankZephyr which garnered great community engagement!
I'm excited to visit Singapore for EMNLP 2023 to present our work "How Does Generative Retrieval Scale to Millions of Passages?"
I will be leading the TREC 2024 Retrieval-Augmented Generation Track! More information coming soon!
We introduced RankVicuna, the first zero-shot listwise reranker that leverages open-source LLMs!
50 papers
Auto-Judge: A Cross-Task Benchmark for Comparing LLM Judges for Citation-Grounded RAG
Naghmeh Farzi, Tim Hagen, Eugene Yang, Maik Fröbe, Ronak Pradeep, Hossein A. Rahmani, Xi Wang, Oleg Zendel, Martin Potthast, Laura Dietz
SIGIR 2026
Automating Generation of Long-Form Queries
Shivani Upadhyay, Daniel Campos, Nandan Thakur, Ronak Pradeep, Nick Craswell, Jimmy Lin
SIGIR 2026
Overview of the TREC 2025 Retrieval Augmented Generation (RAG) Track
Shivani Upadhyay, Nandan Thakur, Ronak Pradeep, Nick Craswell, Daniel Campos, Jimmy Lin
TREC 2025
Assembling Your Personal AI Council in Yupp to Provide Multiple Perspectives
Jimmy Lin, Ronak Pradeep, Gilad Mishne, Pankaj Gupta
WSDM 2026
Dawn Lawrie, James Mayfield, Eugene Yang, Andrew Yates, Sean MacAvaney, Ronak Pradeep, Scott Miller, Paul McNamee, Luca Soldaini
Under Review
Search Arena Meets Nuggets: Towards Explanations and Diagnostics in the Evaluation of LLM Responses
Sahel Sharifymoghaddam, Shivani Upadhyay, Nandan Thakur, Ronak Pradeep, Jimmy Lin
ICTIR 2026
Democratizing and Modernizing Information Access: From Open Rerankers to Scalable RAG Evaluation
Ronak Pradeep
PhD Thesis
Dawn Lawrie, James Mayfield, Eugene Yang, Andrew Yates, Sean MacAvaney, Ronak Pradeep, Scott Miller, Paul McNamee, Luca Soldaini
Under Review
Long Phan, Alice Gatti, Ziwen Han, ..., Ronak Pradeep, ...
Nature
RankLLM: A Python Package for Reranking with LLMs
Sahel Sharifymoghaddam, Ronak Pradeep, Andre Slavescu, Ryan Nguyen, Andrew Xu, Zijian Chen, Yilin Zhang, Yidi Chen, Jasper Xian, Jimmy Lin
SIGIR 2025
Gosling Grows Up: Retrieval with Learned Dense and Sparse Representations Using Anserini
Jimmy Lin, Arthur Haonan Chen, Carlos Lassance, Xueguang Ma, Ronak Pradeep, Tommaso Teofili, Jasper Xian, Jheng-Hong Yang, Brayden Zhong, Vincent Zhong
SIGIR 2025
Nandan Thakur, Ronak Pradeep, Shivani Upadhyay, Daniel Campos, Nick Craswell, Ian Soboroff, Hoa Trang Dang, Jimmy Lin
SIGIR 2025
The Great Nugget Recall: Automating Fact Extraction and RAG Evaluation with Large Language Models
Ronak Pradeep, Nandan Thakur, Shivani Upadhyay, Daniel Campos, Nick Craswell, Jimmy Lin
SIGIR 2025
A Large-Scale Study of Relevance Assessments with Large Language Models Using UMBRELA
Shivani Upadhyay, Ronak Pradeep, Nandan Thakur, Daniel Campos, Nick Craswell, Ian Soboroff, Hoa Trang Dang, Jimmy Lin
ICTIR 2025
Accelerating Listwise Reranking: Reproducing and Enhancing FIRST
Zijian Chen, Ronak Pradeep, Jimmy Lin
SIGIR 2025
LiT and Lean: Distilling Listwise Rerankers into Encoder-Decoder Models
Manveer Singh Tamber, Ronak Pradeep, Jimmy Lin
ECIR 2025
Initial Nugget Evaluation Results for the TREC 2024 RAG Track with the AutoNuggetizer Framework
Ronak Pradeep, Nandan Thakur, Shivani Upadhyay, Daniel Campos, Nick Craswell, Jimmy Lin
arXiv
Ragnarök: A Reusable RAG Framework and Baselines for TREC 2024 Retrieval-Augmented Generation Track
Ronak Pradeep, Nandan Thakur, Sahel Sharifymoghaddam, Eric Zhang, Ryan Nguyen, Daniel Campos, Nick Craswell, Jimmy Lin
ECIR 2025
Jasper Xian, Saron Samuel, Faraz Khoubsirat, Ronak Pradeep, Md Arafat Sultan, Radu Florian, Salim Roukos, Avirup Sil, Christopher Potts, Omar Khattab
arXiv
UMBRELA: UMbrela is the (Open-Source Reproduction of the) Bing RELevance Assessor
Shivani Upadhyay, Ronak Pradeep, Nandan Thakur, Nick Craswell, Jimmy Lin
arXiv
Ronak Pradeep, Daniel Lee, Ali Mousavi, Jeffrey Pound, Yisi Sang, Jimmy Lin, Ihab Ilyas, Saloni Potdar, Mostafa Arefiyan, Yunyao Li
EMNLP 2024 Industry Track
Entity Disambiguation via Fusion Entity Decoding
Junxiong Wang, Ali Mousavi, Omar Attia, Ronak Pradeep, Saloni Potdar, Alexander Rush, Umar Farooq Minhas, Yunyao Li
NAACL 2024
Zero-Shot Cross-Lingual Reranking with Large Language Models for Low-Resource Languages
Mofetoluwa Adeyemi, Akintunde Oladipo, Ronak Pradeep, Jimmy Lin
ACL 2024
Vector Search with OpenAI Embeddings: Lucene Is All You Need
Jimmy Lin, Ronak Pradeep, Tommaso Teofili, Jasper Xian
WSDM 2024 Demo
Towards Automated End-to-End Health Misinformation Free Search with a Large Language Model
Ronak Pradeep, Jimmy Lin
ECIR 2024
RankZephyr: Effective and Robust Zero-Shot Listwise Reranking is a Breeze!
Ronak Pradeep, Sahel Sharifymoghaddam, Jimmy Lin
arXiv
RankVicuna: Zero-Shot Listwise Document Reranking with Open-Source Large Language Models
Ronak Pradeep, Sahel Sharifymoghaddam, Jimmy Lin
arXiv
Carlos Lassance, Ronak Pradeep, Jimmy Lin
TREC 2023
How Does Generative Retrieval Scale to Millions of Passages?
Ronak Pradeep, Kai Hui, Jai Gupta, Adam D Lelkes, Honglei Zhuang, Jimmy Lin, Donald Metzler, Vinh Q Tran
EMNLP 2023, SIGIR 2023 GenIR Workshop
ReadProbe: A Demo of Retrieval-Enhanced Large Language Models to Support Lateral Reading
Dake Zhang, Ronak Pradeep
arXiv
Zero-Shot Listwise Document Reranking with a Large Language Model
Xueguang Ma, Xinyu Zhang, Ronak Pradeep, Jimmy Lin
arXiv
Pre-processing Matters! Improved Wikipedia Corpora for Open-Domain Question Answering
Manveer Singh Tamber, Ronak Pradeep, Jimmy Lin
ECIR 2023 Reproducibility
PyGaggle: A Gaggle of Resources for Open-Domain Question Answering
Ronak Pradeep, Haonan Chen, Lingwei Gu, Manveer Singh Tamber, Jimmy Lin
ECIR 2023 Reproducibility
Neural Query Synthesis and Domain-Specific Ranking Templates for Multi-Stage Clinical Trial Matching
Ronak Pradeep, Yilin Li, Yuetong Wang, Jimmy Lin
SIGIR 2022
Document Expansions and Learned Sparse Lexical Representations for MS MARCO V1 and V2
Xueguang Ma, Ronak Pradeep, Rodrigo Nogueira, Jimmy Lin
SIGIR 2022
Ronak Pradeep, Yuqi Liu, Xinyu Zhang, Yilin Li, Andrew Yates, Jimmy Lin
ECIR 2022 Reproducibility
Another Look at DPR: Reproduction of Training and Replication of Retrieval
Xueguang Ma, Kai Sun, Ronak Pradeep, Minghan Li, Jimmy Lin
ECIR 2022 Reproducibility
New Nails for Old Hammers: Anserini and Pyserini at TREC 2021
Jimmy Lin, Haonen Chen, Chengcheng Hu, Sheng-Chieh Lin, Yilin Li, Xueguang Ma, Ronak Pradeep, Jheng-Hong Yang, Chuan-Ju Wang, Andrew Yates, Xinyu Zhang
TREC 2021 Proceedings
Vera: Prediction Techniques for Reducing Harmful Misinformation in Consumer Health Search
Ronak Pradeep, Xueguang Ma, Rodrigo Nogueira, Jimmy Lin
SIGIR 2021
Chatty Goose: A Python Framework for Conversational Search
Edwin Zhang, Sheng-Chieh Lin, Jheng-Hong Yang, Ronak Pradeep, Rodrigo Nogueira, Jimmy Lin
SIGIR 2021 Demo
Jimmy Lin, Xueguang Ma, Sheng-Chieh Lin, Jheng-Hong Yang, Ronak Pradeep, Rodrigo Nogueira
SIGIR 2021
A Replication Study of Dense Passage Retriever
Xueguang Ma, Kai Sun, Ronak Pradeep, Jimmy Lin
arXiv
H₂oloo at TAC 2020: Epidemic Question Answering
Justin Borromeo, Ronak Pradeep, Jimmy Lin
TAC 2020 Proceedings
Exploring Listwise Evidence Reasoning with T5 for Fact Verification
Kelvin Jiang, Ronak Pradeep, Jimmy Lin
ACL 2021
Ronak Pradeep, Xueguang Ma, Xinyu Zhang, Hang Cui, Ruizhou Xu, Rodrigo Nogueira, Jimmy Lin
TREC 2020 Proceedings
Scientific Claim Verification with VerT5erini
Ronak Pradeep, Xueguang Ma, Rodrigo Nogueira, Jimmy Lin
LOUHI: EACL 2021 Workshop
Edwin Zhang, Nikhil Gupta, Raphael Tang, Xiao Han, Ronak Pradeep, Kuang Lu, Yue Zhang, Rodrigo Nogueira, Kyunghyun Cho, Hui Fang, Jimmy Lin
Scholarly Document Processing: EMNLP 2020 Workshop
The Expando-Mono-Duo Design Pattern for Text Ranking with Pretrained Sequence-to-Sequence Models
Ronak Pradeep, Rodrigo Nogueira, Jimmy Lin
arXiv
Document Ranking with a Pretrained Sequence-to-Sequence Model
Rodrigo Nogueira, Zhiying Jiang, Ronak Pradeep, Jimmy Lin
EMNLP 2020 Findings
Foveated Down-Sampling Techniques
Parsa Torabian, Ronak Pradeep, Jeff Orchard, Bryan Tripp
CVIS 2020
... and a few more papers I might have potentially missed! See my Google Scholar for the complete list.
During my PhD journey, I had the privilege of mentoring over 40 undergraduate and graduate students! Below are some of the amazing students I've had the honor to work with (ordered lexicographically by last name):
Thanks for making it to here :-) As a token of gratitude and since you asked nicely for it, I shall also introduce you to a few of my Spotify playlists.
And everything under the sun is in tune. But the sun is eclipsed by the moon.
A music dump of sorts. Updated regularly.
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An allusion to the Beatles song. Curated by a younger me for someone who stole my heart.
Not updated anymore.
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And what exactly is a dream of love? Here I take on Liszt and attempt to provide a longer answer to aid with my sleep.
Updated semi-regularly.
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