People

Lionel Henry

Senior Software Engineer at Posit, PBC

lionel-

Lionel Henry

Software by Lionel Henry#

devtools

Tools to make an R developer's life easier

2.5k

dplyr

dplyr: A grammar of data manipulation

Tidyverse

forcats

: tools for working with categorical variables (factors)

555

Tidyverse

ggplot2

An implementation of the Grammar of Graphics in R

6.9k

Tidyverse Data Visualization

haven

Read SPSS, Stata and SAS files from R

447

Tidyverse

positron

Positron, a next-generation data science IDE

TypeScript Python R

purrr

A functional programming toolkit for R

1.4k

Tidyverse

readr

Read flat files (csv, tsv, fwf) into R

Tidyverse

recipes

Pipeable steps for feature engineering and data preprocessing to prepare for modeling

613

reticulate

R Interface to Python

1.7k

tidyr

Tidy Messy Data

1.4k

Tidyverse

usethis

Set up commonly used components

899

pkgdown

Generate static html documentation for an R package

765

roxygen2

Generate R package documentation from inline R comments

633

air

R formatter and language server

391

Rust R

tidyverse.org

Source of tidyverse.org

210

HTML

cli

Tools for making beautiful & useful command line interfaces

695

Tidyverse

vroom

Fast reading of delimited files

643

C++

magrittr

Improve the readability of R code with the pipe

967

Tidyverse

webinars

Code and slides for RStudio webinars

1.5k

HTML

dbplyr

Database (DBI) backend for dplyr

505

Tidyverse

gh

Minimalistic GitHub API client in R

232

rlang

Low-level API for programming with R

559

Tidyverse

rstudio-conf

Materials for rstudio::conf

746

HTML

testthat

An R to make testing

925

bslib

Tools for theming Shiny and R Markdown via Bootstrap 3, 4, or 5

551

SCSS

ps

R package to query, list, manipulate system processes

profvis

Visualize R profiling data

311

JavaScript

tibble

A modern re-imagining of the data frame

739

Tidyverse

tidyselect

A backend for functions taking tidyverse selections

128

callr

Call R from R

303

reprex

Render bits of R code for sharing, e.g., on GitHub or StackOverflow

749

Tidyverse

shinymeta

Record and expose Shiny app logic using metaprogramming

226

vctrs

Generic programming with typed R vectors

301

ark

Ark, an R kernel

291

Rust

bench

High Precision Timing of R Expressions

255

carrier

Create standalone functions for remote execution

clock

A Date-Time Library for R

110

conflicted

An alternative conflict resolution strategy for R

254

Tidyverse

coro

Coroutines for R

181

design

Tidyverse design principles

226

dtplyr

Data table backend for dplyr

673

Tidyverse

ellipsis

Tools for Working with ..

140

evaluate

A version of eval for R that returns more information about what happened

139

glue

Glue strings to data in R. Small, fast, dependency free interpreted string literals

745

hex-stickers

RStudio hex stickers

509

hms

A simple class for storing time-of-day values

142

Tidyverse

lifecycle

Manage the life cycle of your exported functions and arguments

lobstr

Understanding complex R objects with tools similar to str()

312

memoise

Easy memoisation for R

321

modelr

Helper functions for modelling

399

Tidyverse

pillar

Format columns with colour

182

Tidyverse

pkgbuild

Find tools needed to build R packages

pkgdepends

R Package Dependency Resolution

129

pkgload

Simulate installing and loading a package

processx

Execute and Control Subprocesses from R

243

rcmdcheck

Run R CMD check from R and collect the results

122

remotes

Install R packages from GitHub, GitLab, Bitbucket, git, svn repositories, URLs

355

revdepcheck

R package reverse dependency checking

103

Shiny

Easy interactive web applications with R

5.6k

style

The tidyverse style guide for R code

353

SCSS

svglite

A lightweight svg graphics device for R

199

C++

tidy-dev-day

Tidyverse developer day

tree-sitter-r

Tree-sitter grammar for R

127

tune

Tools for tidy parameter tuning

324

vdiffr

Visual regression testing and graphical diffing with testthat

195

C++

withr

Methods For Temporarily Modifying Global State

177

Posts and resources by Lionel Henry#

video

Air - A blazingly fast R code formatter (Davis Vaughn & Lionel Henry, Posit) | posit::conf(2025)

Air - A blazingly fast R code formatter (Davis Vaughn & Lionel Henry, Posit) | posit::conf(2025)

Air - A blazingly fast R code formatter Speaker(s): Davis Vaughan; Lionel Henry Abstract: In Python, Rust, Go, and many other languages, code formatters are widely loved. They run on every save, on every pull request, and in git pre-commit hooks to ensure code consistently looks its best at all times. In this talk, you'll learn about Air, a new R code formatter. Air is extremely fast, capable of formatting individual files so fast that you'll question if its even running, and of formatting entire projects in under a second. Air integrates directly with your favorite IDEs, like Positron, RStudio, and VS Code, and is available on the command line, making it easy to standardize on one tool even for teams using various IDEs. Once you start using Air, you'll never worry about code style ever again! posit::conf(2025) Subscribe to posit::conf updates: https://posit.co/about/subscription-management/

Davis Vaughan, Lionel Henry

Nov 7, 2025

17 min

air positron rstudio Posit::conf(2025) Rstats Python Data Science Data

video

Air: A blazingly fast R code formatter - Davis Vaughan, Lionel Henry

Air: A blazingly fast R code formatter - Davis Vaughan, Lionel Henry

In Python, Rust, Go, and many other languages, code formatters are widely loved. They run on every save, on every pull request, and in git pre-commit hooks to ensure code consistently looks its best at all times. In this talk, you'll learn about Air, a new R code formatter. Air is extremely fast, capable of formatting individual files so fast that you'll question if its even running, and of formatting entire projects in under a second. Air integrates directly with your favorite IDEs, like Positron, RStudio, and VS Code, and is available on the command line, making it easy to standardize on one tool even for teams using various IDEs. Once you start using Air, you'll never worry about code style ever again! https://www.tidyverse.org/blog/2025/02/air/ https://github.com/posit-dev/air

Davis Vaughan, Lionel Henry

Oct 28, 2025

14 min

air positron rstudio tidyverse tidyverse.org

blog post

Air, an extremely fast R formatter

We are thrilled to announce Air, a new R formatter

Davis Vaughan, Lionel Henry

Feb 21, 2025

Tidyverse

video

Introducing Positron, a new data science IDE - posit conf 2024

Introducing Positron, a new data science IDE - posit conf 2024

Positron is a next-generation data science IDE that is newly available to the community for early beta testing. This new IDE is an extensible tool built to facilitate exploratory data analysis, reproducible authoring, and publishing data artifacts. Positron currently supports these data workflows in either or both Python and R and is designed with a forward-looking architecture that can support other data science languages in the future. In this session, learn from the team-building Positron about how and why it is designed the way it is, what will feel familiar or new coming from other IDEs, and whether it might be a good fit for your own work. Talk by Julia Silge, Isabel Zimmerman, Tom Mock, Jonathan McPherson, Lionel Henry, Davis Vaughan, and Jenny Bryan Slide deck 1: https://speakerdeck.com/juliasilge/introducing-positron Slide deck 6: https://speakerdeck.com/jennybc/positron-for-r-and-rstudio-users

Davis Vaughan, Isabel Zimmerman, Jenny Bryan, Julia Silge, Lionel Henry

Lionel Henry | Interactivity and Programming in the Tidyverse | RStudio (2020)

In Tidyverse grammars such as dplyr you can refer to the columns in your data frames as if they were objects in the workspace. This syntax is optimised for interactivity and is a great fit for data analysis, but it makes it harder to write functions and reuse code. In this talk we present some advances in the tidy eval framework that make it easier to program around Tidyverse pipelines without having to learn a lot of theory

Lionel Henry

Nov 14, 2020

18 min

dplyr rstudio tidyverse Rstudio::conf(2020) Lionel Henry RStudio Data Science Machine Learning Python Stats Tidyverse Data Visualization Data Viz Ggplot Technology Coding Connect Server Pro Shiny Rmarkdown Package Manager CRAN Interoperability Serious Data Science Dplyr Forcats Ggplot2 Tibble Readr Stringr Tidyr Purrr Github Data Wrangling Tidy Data Odbc Rayshader Plumber Blogdown Gt Lazy Evaluation Tidymodels Statistics Debugging Programming Education Rstats Open Source Oss Reticulate

video

Lionel Henry | Working with names and expressions in your tidy eval code | RStudio (2019)

Lionel Henry | Working with names and expressions in your tidy eval code | RStudio (2019)

n practice there are two main flavors of tidy eval functions: functions that select columns, such as `dplyr::select()`, and functions that operate on columns, such as `dplyr::mutate()`. While sharing a common tidy eval foundation, these functions have distinct properties, good practices, and available tooling. In this talk, you'll learn your way around selecting and doing tidy eval style. Materials: https://speakerdeck.com/lionelhenry/selecting-and-doing-with-tidy-eval

Lionel Henry

Jul 19, 2019

16 min

dplyr rstudio Lionel Henry RStudio Data Science Machine Learning Python Stats Tidyverse Data Visualization Data Viz Ggplot Technology Coding Connect Server Pro Shiny Rmarkdown Package Manager CRAN Interoperability Serious Data Science Dplyr Forcats Ggplot2 Tibble Readr Stringr Tidyr Purrr Github Data Wrangling Tidy Data Odbc Rayshader Plumber Blogdown Gt Lazy Evaluation Tidymodels Statistics Debugging Programming Education Rstats Open Source Oss Reticulate