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Abigail Charles

@abigailcharles1

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Chief AI Officer at FAHalways building clinical AI assistants that improve efficiency and reduce costs.

United States

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At FAHalways, I guide clients on AI strategy, governance, and implementation while overseeing teams developing AI capabilities. I developed a Databricks-based clinical review tool to help pharmacists generate prior authorization justifications, and led a second-phase assistant that increased efficiency by 45% and decreased costs by 15%.

At CVS Pharmacy, I built and developed a 15-member data science team and generated $40M in revenue during 2022–2023. Earlier, at Stripe, I directed data science initiatives that contributed to a $10M revenue increase, and at Optum I worked on the CHALLENGER fraud detection engine, generating $20M in savings.

Experience

Work history, roles, and key accomplishments

Current

Founder and Chief AI Officer

Current

FAHalways

Sep 2023 - Present (3 years 1 month)

Founded and led AI strategy and implementation for clients, overseeing technical design, development, and scaling of AI capabilities. Developed multiple AI solutions including an intelligent prior authorization assistant and a member-facing copay explainer.

Databricks AWS Azure OpenAI GPT 4 Lang Chain MCP RAG Faiss Streamlit Gradio Python Delta Lake Unity Catalog fastAPI Azure OpenAI Spark LLMOps

Senior Director of Data Science

CVS Pharmacy

Mar 2022 - Oct 2024 (2 years 7 months)

Hired and developed a team of 15 data scientists to target Rx Retail Pharmacy growth goals through advanced analytics, AI/ML, and experimentation. Generated $40M in revenue from 2022-2023 and led multiple product workstreams.

Data Science Machine Learning Experimentation Generative AI LLM Fine tuning RAG Python SQL Dashboarding Stakeholder Management Team Leadership

Lead Data Scientist & Technical Product Manager

Stripe

Oct 2020 - Mar 2022 (1 year 5 months)

Developed strategic direction for data science needs to enhance product capabilities in the payments space. Directed initiatives leading to a $10M revenue increase and managed a team of junior data scientists.

Data Science Product Management Machine Learning Mentorship Recruitment Data Analysis Stakeholder Management

Director of Data Science

H2O.ai

Sep 2019 - Jul 2020 (10 months)

Led data science team in presenting H2O capabilities to customers, generating $3M in sales. Scoped machine learning use cases across healthcare, manufacturing, pharmaceuticals, AdTech, oil & gas, and telecom.

Data Science Machine Learning H2O Customer Presentations Scoping Product Development

Expert Director of Data Science

McKinsey & Company

Jul 2018 - Sep 2019 (1 year 2 months)

Led teams of data scientists and data engineers across healthcare client-facing teams. Contributed to developing healthcare Data Science COE advanced analytics capabilities and led workshops with clients.

Data Science Healthcare Analytics RWD RWE Team Leadership Client Workshops Machine Learning predictive modeling

Data Science Senior Manager

PwC

Jan 2017 - Dec 2017 (11 months)

Led teams of data scientists and data engineers across healthcare client-facing teams. Managed multiple client projects including predictive modeling for Baker Hughes, Star Quality ratings analysis for Blue Cross Blue Shield, and meter fire detection for IPL.

Data Science Machine Learning predictive modeling Team Management Client Delivery Python R SAS LSTM Random Forest Anomaly Detection

Senior Consultant, Data Scientist

Accenture

Dec 2015 - Dec 2016 (1 year)

Understood client requirements and worked with big data, creating statistical models for informed business decisions. Demonstrated proficiency in predictive analytics and data mining, and implemented data warehouse solutions.

Data Science Predictive Analytics Data Mining SAS SPSS R MapReduce Data Warehouse Text Mining Tableau

Senior Data Scientist

United Health Group (UHG), Optum

Dec 2012 - Dec 2015 (3 years)

Developed modules and enhanced methodology for analysis of medical claims data, including building and updating models for fraud detection. Generated $20M in savings and implemented dual model for reducing false positives.

SAS Fraud Detection Statistical Modeling RWD RWE ETL VBA Access Predictive Analytics Data Analysis

Senior Data Analyst

Healthfirst, Finance Corporation

Oct 2011 - Dec 2012 (1 year 2 months)

Performed advanced SAS programming for automation of finance processes including IBNR allocation. Developed GUI in Access using VBA and SAS, and designed queries to analyze data across multiple sources.

SAS VBA Access IBNR Data Analysis Reporting UAT Microsoft Dynamics AX

Biostatistician

College of Physicians & Surgeons (Oncology), Columbia Univer

Sep 2008 - Sep 2011 (3 years)

Analyzed data from clinical trials using SAS, STATA, and SPSS, including time series, survival analysis, and regression. Designed pilot studies and produced statistical analyses for clinical trials.

SAS Stata SPSS Survival Analysis regression GEE Clinical Trials RWD RWE

Expert Contributor

Snorkel AI

Served as an expert contributor on human-in-the-loop data development programs for frontier large language models. Authored and curated expert-level reasoning tasks, conducted quality-control reviews, and standardized documentation.

LLM Evaluation Prompt Engineering Data Annotation Quality Control OpenAI GPTs Anthropic: Claude Gemini Meta’S LLaMA Mistral Qwen Deep Seek Nemotron Databricks Azure OpenAI AWS

Education

Degrees, certifications, and relevant coursework

Columbia University

Doctor of Philosophy, Mathematics and Education

Doctor of Philosophy in Mathematics and Education with a research focus on mathematical/statistical theory applications and genetics. Dissertation titled 'Statistics for Learning Genetics'.