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Hadley Wickham on GitHub

Hadley Wickham

@hadley

Chief Scientist at @posit-pbc

  • @posit-pbc
  • Houston, TX
  • 19K
    Total stars
  • 27K
    Followers
  • 204
    Public repos
  • 5,646
    Contributions

1 following

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Profile tree

  • Contributions: 5,646. Past 12 months.
  • Followers: 26,785. People who follow you.
  • Total stars: 18,563. Across all repos.
  • Following: 1. People you follow.
  • Public repos: 204. Owned, non-fork.

A living snapshot

Every leaf is a headline number from Hadley Wickham’s public GitHub. The canopy fills out as the work grows - sway and all.

  • 5,646 Contributions Past 12 months
  • 27K Followers People who follow you
  • 19K Total stars Across all repos
  • 1 Following People you follow
  • 204 Public repos Owned, non-fork

Data from GitHub API · refreshed in real time

What your GitHub says

Based on public GitHub activity · how this is calculated

  • C is the largest language share across analyzed repositories, at 41%.

    High confidence

  • Public GitHub activity is implementation-heavy: commits account for 71% of tracked contribution activity.

    Medium confidence

  • Most analyzed repositories (31 of 40) show no public activity in over a year.

    Medium confidence

  • This analysis covers 40 of 204 public repositories (20%); broader totals may differ.

    High confidence

Profile health

Signals from analyzed public data

Activity 100

Strong

  • 5,646 contributions in the trailing year
  • 369-day current streak
Portfolio 37

Needs work

  • 4 of 40 analyzed repositories are actively maintained
  • 18,563 stars across analyzed repositories
Discoverability 44

Needs work

  • 2 of 40 analyzed repositories have no description
  • 33 of 40 have no topic tags
Maintenance 10

Needs work

  • 4 of 40 analyzed repositories were pushed to in the last 6 months
  • 31 show no public activity in over a year
Collaboration 34

Needs work

  • 772 pull requests and 291 code reviews in the trailing year
  • 114 repositories starred

Recruiter snapshot

A skim of public evidence, not a hiring judgement

Technical focus
C / R / C++ / JavaScript

Largest language shares across analyzed repositories

Project depth
4 of 40

Analyzed repositories rated established or maintained

Collaboration
772 PRs / 291 reviews

Public pull requests and code reviews in the trailing year

Community signals
18,563 stars / 9,756 forks

Summed across analyzed repositories

Recent activity
12 of last 12 months

Calendar months with at least one tracked contribution

Strongest signals

  • 5,646 contributions in the trailing year

5,646
Contributions
Past 12 months
369
Current streak
Sep 21, 2025 – Sep 24, 2026
369
Longest streak
Sep 21, 2025 – Sep 24, 2026
Sep Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Mon Wed Fri
Less More

Language distribution for hadley C 41.3%, R 21.5%, C++ 11.3%, JavaScript 8.9%, TeX 7.8%, Perl 7.0%, Other 2.3%
  • C 41.3%
  • R 21.5%
  • C++ 11.3%
  • JavaScript 8.9%
  • TeX 7.8%
  • Perl 7.0%
  • Other 2.3%

Frontend Backend Mobile DevOps Data AI Security Embedded Game Dev
  • Data 100
  • Frontend 32
  • Embedded 24
  • DevOps 5
  • Backend 0
  • Mobile 0
  • AI 0
  • Security 0
  • Game Dev 0

Longest streak
369d
Sep 2025
Favourite coding day
Tuesday
1,052 contributions
Most active year
2025
5,238 contributions
Signature language
C
41% of tracked code
Flagship repository
r4ds
5,166 stars
On GitHub since
2008
18 years and counting

Hadley Wickham maintains a public GitHub presence built primarily around C, which accounts for roughly 41% of their committed code, alongside R and C++. The profile lists 204 public repositories that have attracted 18,563 stars, led by r4ds at 5,166. Over the past year they recorded 5,646 contributions, including a longest run of 369 consecutive active days. Hadley Wickham has been on GitHub since 2008 and is followed by 26,785 developers.

This overview is generated from Hadley Wickham’s public GitHub activity at the time of the last refresh. Figures cover public repositories and the trailing twelve months of contributions.

  1. 01

    Review adv-r

    High impact

    adv-r is pinned to your profile but hasn't been pushed to in over a year.

    adv-r →
  2. 02

    Add topics to ggplot2-book

    Low impact

    ggplot2-book has no topic tags, making its technology harder to discover.

    ggplot2-book →
  3. 03

    Add topics to r-pkgs

    Low impact

    r-pkgs has no topic tags, making its technology harder to discover.

    r-pkgs →
  4. 04

    Add topics to tidy-data

    Low impact

    tidy-data has no topic tags, making its technology harder to discover.

    tidy-data →

How these are calculated: see the methodology page .

r4ds

R for data science: a book

  • book
  • bookdown
  • data-science
  • r
R 5,166 ★ 4,444 forks 22 issues yesterday
NOASSERTION Live demo GitHub
stats337

Readings in applied data science

  • teaching
  • data-science
R 1,611 ★ 223 forks 5 issues 22d ago
CC-BY-SA-4.0 GitHub
plyr

A R package for splitting, applying and combining large problems into simpler problems

R 504 ★ 112 forks 27 issues 5mo ago
NOASSERTION Live demo GitHub
emo

Easily insert emoji into R and RMarkdown

  • r
  • emoji
R 418 ★ 52 forks 38 issues 27d ago
GitHub

Most popular
r4ds

5,166 stars

Most recently active
r-pkgs

Last pushed 1d ago

Longest maintained
r-pkgs

Active for 12.1y

Most discoverable
r4ds

100% of discoverability signals present

dplyr

dplyr: A grammar of data manipulation

R 5,070 ★ 2,114 forks
tidyverse

Easily install and load packages from the tidyverse

R 1,800 ★ 292 forks
r4ds

R for data science: a book

R 5,166 ★ 4,444 forks
devtools

Tools to make an R developer's life easier

R 2,518 ★ 762 forks
adv-r

Advanced R: a book

TeX 2,456 ★ 1,687 forks
ellmer

Call LLM APIs from R

R 613 ★ 140 forks

All repositories →

Public visibility is moderately spread across several repositories rather than one or two.

Top 1 repository 28% of stars
Top 3 repositories 50% of stars
Top 5 repositories 66% of stars

Leading repository: r4ds (5,166 stars, 18,563 total across analyzed repositories)

Technology breakdown

Derived from repository languages and topics - horizontal bars, never a pie.

Languages

  • C 41%
  • R 22%
  • C++ 11%
  • JavaScript 9%
  • TeX 8%
  • Perl 7%

README, contributing-guide and GitHub Actions badges below are detected by exact filename on each repository’s default branch - they report presence, not quality.

  • r4ds Established
    Popularity 100
    Discoverability 100
    Maintenance 85
    README No contributing guide CI: 1 workflow
  • r-pkgs Established
    Popularity 17
    Discoverability 75
    Maintenance 100
    README Contributing guide CI: 1 workflow
  • mastering-shiny Developing
    Popularity 22
    Discoverability 100
    Maintenance 40
    README No contributing guide CI: 1 workflow
  • adv-r Dormant
    Popularity 44
    Discoverability 100
    Maintenance 15
    README Contributing guide CI: 1 workflow
  • r-internals Established
    Popularity 5
    Discoverability 50
    Maintenance 100
    README No contributing guide CI: 1 workflow
  • reshape Developing
    Popularity 3
    Discoverability 75
    Maintenance 40
    README No contributing guide CI: 4 workflows
  • genzplyr Developing
    Popularity 3
    Discoverability 75
    Maintenance 40
    README No contributing guide CI: 1 workflow
  • stats337 Dormant
    Popularity 22
    Discoverability 75
    Maintenance 0
    README No contributing guide No CI workflow
  • plyr Dormant
    Popularity 7
    Discoverability 75
    Maintenance 15
    README No contributing guide CI: 2 workflows
  • strict Dormant
    Popularity 3
    Discoverability 75
    Maintenance 15
    README No contributing guide CI: 3 workflows
  • ggplot2-book Dormant
    Popularity 27
    Discoverability 50
    Maintenance 15
    README No contributing guide CI: 1 workflow
  • lazyeval Maintained
    Popularity 2
    Discoverability 25
    Maintenance 65
    README No contributing guide CI: 3 workflows

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Ajoutez vos informations
Coordonnées
Expérience
Formation

204
Public repos
40 analyzed
19K
Total stars
Across all repos
5,646
Contributions
Past 12 months
772
Pull requests
Opened this year
184
Public gists
Snippets shared
18 y
Account age
Since 2008
100 %
Profile score
Completeness

Repository explorer

→

Name Language Stars Forks Size Updated

Coding statistics

→
Largest repository
555.6 MB
data-housing-crisis
Smallest repository
14 KB
precis
Oldest repository
May 19, 2008
ggplot2-book
Newest repository
Nov 6, 2025
genzplyr
Most starred
5,166 ★
r4ds
Most forked
4,444 forks
r4ds
Most watched
217 watchers
r4ds
Longest description
86 characters
plyr
Most open issues
97 open
adv-r

Contribution patterns

→

By year

  • 2026
    3,835
  • 2025
    5,238
  • 2024
    4,446
  • 2023
    4,232
  • 2022
    4,714
  • 2021
    4,279

By day of week

  • Sun
    271
  • Mon
    1,034
  • Tue
    1,052
  • Wed
    856
  • Thu
    992
  • Fri
    857
  • Sat
    318

Best coding day: Tue

By month (last 12)

  • Oct
    373
  • Nov
    450
  • Dec
    529
  • Jan
    364
  • Feb
    237
  • Mar
    535
  • Apr
    354
  • May
    425
  • Jun
    604
  • Jul
    596
  • Aug
    457
  • Sep
    263

GitHub journey

→
  1. April 2008

    Joined GitHub

    Created the @hadley account.

  2. May 2008

    Created first repository

    Published ggplot2-book, the oldest repository still on the account.

  3. May 2008

    First starred repository

    ggplot2-book is the earliest-created repository to have earned stars.

  4. July 2012

    Reached 10 repositories

    r2d3 was the 10th public repository created.

  5. June 2025

    Most productive year: 2025

    5,238 contributions recorded in 2025, more than any other year on record.

  6. November 2025

    Latest repository

    genzplyr is the most recently created repository.

Developer evolution

Your GitHub career, year by year.

 →
2008

Started with R.

Perl R
Repos this year
4
Total repos
4
Stars, as of today
2.5k
ggplot2-book
2009

Went deeper into R.

R Ruby
Repos this year
3
Total repos
7
Stars, as of today
2.9k
data-baby-names
2011

Shifted from R to TeX.

TeX
Repos this year
1
Total repos
8
Stars, as of today
3.4k
tidy-data
2012

Shifted from TeX to C++.

C++ JavaScript
Repos this year
2
Total repos
10
Stars, as of today
3.9k
bigvis
2013

Shifted from C++ to R.

JavaScript R TeX
Repos this year
7
Total repos
17
Stars, as of today
7.0k
adv-r
2014

Went deeper into R.

C C++ R
Repos this year
5
Total repos
22
Stars, as of today
8.4k
r-pkgs
2015

Shifted from R to C.

C R
Repos this year
2
Total repos
24
Stars, as of today
14k
r4ds
2016

Shifted from C to R.

HTML R
Repos this year
3
Total repos
27
Stars, as of today
15k
mastering-shiny
2017

Went deeper into R.

C++ R
Repos this year
4
Total repos
31
Stars, as of today
16k
emo
2018

Went deeper into R.

R
Repos this year
3
Total repos
34
Stars, as of today
18k
stats337
2019

Went deeper into R.

R
Repos this year
1
Total repos
35
Stars, as of today
18k
tidy-tools
2020

Went deeper into R.

R
Repos this year
1
Total repos
36
Stars, as of today
18k
stringb
2024

Went deeper into R.

R SCSS
Repos this year
3
Total repos
39
Stars, as of today
18k
Contributions
4,446
r-in-production
2025

Went deeper into R.

R
Repos this year
1
Total repos
40
Stars, as of today
19k
Contributions
5,238
genzplyr

Built from hadley’s public, non-fork repositories. Star totals reflect current counts, not historical snapshots.

Achievements

8 / 9 unlocked

Explorer
Created repositories in 8 or more languages
Builder
More than 50 public repositories
Open Source Enthusiast
100+ stars received across all repositories
Consistent
A 100-day-or-longer contribution streak
Documentation Hero
5 or more repositories with a detailed description
Popular
500 or more followers
Prolific Committer
1,000 or more commits in the past 12 months
Long Timer
5 or more years on GitHub
Star Collector
Starred 100 or more repositories

Open source activity

18,563
Stars received
114
Repositories starred
9,756
Forks received
419
Issues opened
Past 12 months
772
Pull requests opened
Past 12 months
291
Reviews given
Past 12 months
184
Public gists

Language evolution

The primary languages of repositories created each year.

2008
  • Perl
  • R
2009
  • R
  • Ruby
2011
  • TeX
2012
  • C++
  • JavaScript
2013
  • JavaScript
  • R
  • TeX
2014
  • C
  • C++
  • R
2015
  • C
  • R
2016
  • HTML
  • R
2017
  • C++
  • R
2018
  • R
2019
  • R
2020
  • R
2024
  • R
  • SCSS
2025
  • R

Repository growth

Repositories created per year, and the running total.

4 repositories created in 2008 3 repositories created in 2009 1 repositories created in 2011 2 repositories created in 2012 7 repositories created in 2013 5 repositories created in 2014 2 repositories created in 2015 3 repositories created in 2016 4 repositories created in 2017 3 repositories created in 2018 1 repositories created in 2019 1 repositories created in 2020 3 repositories created in 2024 1 repositories created in 2025 4 total repositories by end of 2008 7 total repositories by end of 2009 8 total repositories by end of 2011 10 total repositories by end of 2012 17 total repositories by end of 2013 22 total repositories by end of 2014 24 total repositories by end of 2015 27 total repositories by end of 2016 31 total repositories by end of 2017 34 total repositories by end of 2018 35 total repositories by end of 2019 36 total repositories by end of 2020 39 total repositories by end of 2024 40 total repositories by end of 2025 2008 2009 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2024 2025 40 0
Created that year Cumulative total

Language tree

Built automatically from repository languages and topics.

Programming Languages →
  • C
  • R
  • C++
  • JavaScript
  • TeX
  • Perl