Ashley (Ash) Lewis

PhD Candidate in Computational Linguistics

The Ohio State University

On the job market for 2025

Ashley (Ash) Lewis

About Me

I am a PhD candidate in Computational Linguistics at The Ohio State University, where I work with Dr. Michael White. My research focuses on mitigating hallucinations in dialogue systems through efficient, data-driven approaches. I am graduating in May 2025 and actively seeking opportunities in research and industry.

Prior to my PhD, I received my BA in English and BA in Linguistics from the University of Kentucky in 2013. Before starting grad school, I spent three years abroad teaching English—one year in Poland and two years in South Korea.

My international experience and background in linguistics inform my approach to NLP research, giving me a unique perspective on language understanding and human-AI interaction.

Research

My research focuses on mitigating hallucinations in interactive dialogue systems through efficient, data-driven approaches, with the goal of enhancing the usability of AI-driven systems in resource-constrained environments.

Hallucination Mitigation

Investigating scalable methods such as knowledge distillation, self-training, and synthetic data generation to improve factual accuracy and reliability of domain-specific dialogue models.

Evaluation Frameworks

Developing robust evaluation frameworks to better quantify hallucinations in dialogue settings, combining automated metrics with human evaluation for more effective assessment.

Efficient NLP

Optimizing training and evaluation methodologies to reduce misinformation while maintaining system efficiency, particularly for deployment in resource-constrained environments.

Publications

2025

VISTA Score: Verification In Sequential Turn-based Assessment

Ashley Lewis, Andrew Perrault, Eric Fosler-Lussier, Michael White

arXiv preprint (Under review)

Winning Big with Small Models: Knowledge Distillation vs. Self-Training for Reducing Hallucination in QA Agents

Ashley Lewis, Michael White, Jing Liu, Toshiaki Koike-Akino, Kieran Parsons, Ye Wang

GEM Workshop @ ACL 2025, Vienna, Austria

2024

Smoothed Embeddings for Robust Language Models

Ryo Hase, Md Rafi Ur Rashid, Ashley Lewis, Jing Liu, Toshiaki Koike-Akino, Kieran Parsons, Ye Wang

Safe Generative AI Workshop @ NeurIPS 2024

OSU CompLing at the GEM'24 Data-to-Text Task

Alyssa Allen, Ashley Lewis, Yi-Chien Lin, Tomiris Kaumenova, Michael White

INLG 2024, Tokyo, Japan

Insights of a Usability Study for KBQA Interactive Semantic Parsing: Generation Yields Benefits over Templates but External Validity Remains Challenging

Ashley Lewis, Lingbo Mo, Marie-Catherine de Marneffe, Huan Sun, Michael White

HumEval Workshop @ LREC-COLING 2024, Torino, Italy

2023

Mitigating Harms of LLMs via Knowledge Distillation for a Virtual Museum Tour Guide

Ashley Lewis, Michael White

TLLM Workshop @ INLG 2023, Prague, Czech Republic

Roll Up Your Sleeves: Working with a Collaborative and Engaging Task-Oriented Dialogue System

Lingbo Mo, Shijie Chen, Ziru Chen, Xiang Deng, Ashley Lewis, Sunit Singh, Samuel Stevens, Chang-You Tai, Zhen Wang, Xiang Yue, Tianshu Zhang, Yu Su, Huan Sun

SIGDIAL 2023, Prague, Czechia

2022

Towards Transparent Interactive Semantic Parsing via Step-by-Step Correction

Lingbo Mo, Ashley Lewis, Huan Sun, Michael White

Findings of ACL 2022, Dublin, Ireland

INSPIRED: A Large-Scale Dataset and Simulation Framework for Exploring Interactive Learning in Knowledge-Based Question Answering

Lingbo Mo, Ashley Lewis, Huan Sun, Michael White

InterNLP Workshop 2022

Bootstrapping a User-Centered Task-Oriented Dialogue System

Shijie Chen, Ziru Chen, Xiang Deng, Ashley Lewis, Lingbo Mo, Samuel Stevens, Zhen Wang, Xiang Yue, Tianshu Zhang, Yu Su, Huan Sun

Alexa Prize TaskBot Challenge 2022

Invited Talks

I enjoy speaking about AI hallucination, dialogue systems, and making NLP research accessible. Available for speaking engagements — reach out via LinkedIn.

Upcoming

May 2026

Huntington National Bank's 2026 Analytics & Data Expo

Feb 2026

AI Ethics Workshop at Tsukuba University

Tokyo, Japan

Past

Dec 2025

Dublin City University's NLP Group Meeting

Sep 2025

Center for Cognitive and Brain Sciences Fall Retreat

Introducing VISTA Score: Verification in Sequential Turn-Based Assessment

Curriculum Vitae

A summary of my academic background, research experience, and achievements.

Education

  • PhD in Computational Linguistics — The Ohio State University (Expected May 2025)
  • BA in English — University of Kentucky (2013)
  • BA in Linguistics — University of Kentucky (2013)

Experience

  • Graduate Research Assistant — The Ohio State University
  • English Teacher — South Korea (2 years)
  • English Teacher — Poland (1 year)

Awards

  • See CV for full list
Download Full CV (PDF)

Embroidery

When I'm not researching NLP, I embroider. I'm available for commissions — check out more of my work on Instagram.

Contact

I'm always happy to chat about research, collaborations, job opportunities, or speaking engagements. The best way to reach me is via LinkedIn.