Daniel W. Barowy

Daniel W. Barowy
Assistant Professor
Department of Computer Science
Williams College

Room 307
Thompson Chemistry Labs
Williams College
Williamstown, MA 01267

About Me

I am an Assistant Professor in the Williams College Department of Computer Science. My area of research is programming languages.

Curriculum vita (PDF 120K)

Office Hours

I am available on Wednesdays from 10am—noon and on Thursdays from 4pm—6pm in TCL 307. If you are unable to come during those hours, please email me to set up an appointment.



Spring 2019 CSCI 136: Data Structures & Advanced Programming
Winter 2019 CSCI 11: Hour of Code Hour of Code press
Fall 2018 CSCI 334: Principles of Programming Languages
Spring 2018 CSCI 334: Principles of Programming Languages
Fall 2017 CSCI 331: Introduction to Computer Security
Spring 2017 COMSC 201: Advanced Object-Oriented Programming (@ Mount Holyoke College)


Research Statement

I am interested in the design and implementation of programming languages. In particular, two questions motivate most of my research: "Can this program be made simpler to use?" and "Can this program be made more robust?" Surprisingly, the answers to these questions often complement each other.

My work focuses on new language abstractions, end-user programming, and new debugging techniques. In particular, I am excited about improving the user experience when programming with spreadsheets and with crowdsourcing. I employ traditional programming language techniques like program analysis, but somewhat unusually, I often blend these with statistical approaches.

Reproducible Research

The exercise of building real software often reveals important flaws and shortcomings in one's research. I strongly support the practice of submitting software 'artifacts' to optional Artifact Evaluation Committees. Building these artifacts does indeed substantially increase the effort required to do research. But artifacts are worth the time because they enable reviewers (and others) to validate one's claims independently.

My work on CheckCell, ExceLint, and FlashRelate were all awarded "Artifact Verified" badges. FlashRelate was awarded PLDI '15's "best-of" prize, the Distinguished Artifact Award. I am in good company, as my colleagues in the PLASMA Lab won the PLDI Distinguished Artifact Award three years in a row! (2014, 2015, 2016) My PL colleague at Williams, Stephen Freund, won the award in 2017. Since we want everyone to produce and release good software artifacts, we wrote a guide that we hope you find helpful when submitting your research to an Artifact Evaluation Committee.


Year Venue Kind Title
2018 OOPSLA Conference ExceLint: Automatically Finding Spreadsheet Formula Errors Verified artifact. , ExceLint slides. , OOPSLA 2018 talk.
2017 Dissertation Spreadsheet Tools for Data Analysts
2017 CHI Conference VoxPL: Programming with the Wisdom of the Crowd
2016 CACM Journal AutoMan: A Platform for Integrating Human-Based and Digital Computation Research Highlight.
2015 PLDI Conference FlashRelate: Extracting Relational Data from Semi-Structured Spreadsheets Using Examples Verfied artifact. ,PLDI 2015 Distinguished Artifact Award. ,FlashRelate slides.
2014 OOPSLA Conference CheckCell: Data Debugging for SpreadsheetsVerfied artifact., CheckCell slides. , OOPSLA 2014 talk.
2012 OOPSLA Conference AutoMan: A Platform for Integrating Human-Based and Digital Computation AutoMan slides.

Workshops, Posters, etc.

Year Venue Kind Title
2019 Microsoft TechFest 2019 Workshop ExceLint: Automatically Finding Spreadsheet Formula Errors (presented by Ben Zorn and Emery Berger)
2017 IBM PL Day Workshop VoxPL: Programming with the Wisdom of the Crowd
2017 IBM PL Day Workshop ExceLint: Automatically Finding Formula Errors in Spreadsheets (presented by Emery Berger)
2016 NEPLS Workshop WoCMan: Programming with the Wisdom of the Crowd
2016 ASPLOS WAX Workshop WoCMan: Harnessing the Wisdom of the Crowd for High-Quality Estimates
2016 POPL SRC Poster WoCMan: Harnessing the Wisdom of the Crowd for High-Quality Estimates
2014 POPL OBT Workshop Data Debugging
2013 Follow the Crowd Blog Post AutoMan: Programming with People Invited article.
2011 NIPS CSS Workshop AutoMan: Integrating Human and Silicon Computation AutoMan NIPS poster.


Project Purpose Language
ExceLint An Excel plugin for finding formula errors. F# / C#
AutoMan/VoxPL A DSL for writing crowdsourcing programs using simple Scala functions. Scala
FlashRelate A tool for extracting semi-structured spreadsheet data as relational tables. F#/C# Not available :( Proprietary Microsoft software. See Cole Erickson's Flare compiler for a reimplementation of the DSL.
CheckCell A tool for finding input errors in spreadsheets. C#
Depends Generate data dependence graphs from spreadsheet computations. C#
Parcel An Excel formula parser. F#/FParsec
Bingerator Query the Bing search engine using sequence comprehensions. Scala
Schedulous Schedule events using CSVs. Scala/Z3


Date Article
January 15, 2019 Pownal students learn coding Bennington Banner
June 14, 2016 AutoMan appears as CACM research highlight UMass College of Computer and Information Sciences
June 18, 2015 Data stuck in Excel? UMass College of Computer and Information Sciences
Jan 21, 2015 10 cool network and computing research projects NetworkWorld
Oct 27, 2014 CheckCell promises to finger all-too-common Excel spreadsheet errors NetworkWorld
Oct 24, 2014 Powerful new software plug-in detects bugs in spreadsheets Phys.org
Dec 5, 2012 Your next boss could be a computer New Scientist