Welcome to Yan Holtz's homepage.
I'm a data analysis and data visualisation specialist currently working as a software engineer for Datadog.

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Hi, I'm Yan.

My job consists in helping companies and researchers to analyse their datasets. I am skilled for most data-science steps: data pre-processing, application of statistical methods, data visualization and results communication.

After having worked for renowned research institutes like the University of Queensland and private companies like Terres Inovia, I'm now working for Datadog as a software engineer.

Publications Talks Twitter Github
2012 Master Degree Mtp Supagro 2016 Data Analyst French Institute of Research 2017 Data analyst Terres Inovia 2019 Data visualization Qld Brain Institute Data - Science - Viz Freelance


Let me help make better use of your data. My expertise can be used to clean, analyse, interpret and visualize your data.

Data Management

Data harvesting, cleaning and reshaping. Development of automated workflows.


Data Mining

Data exploration, application of statistical methods, reproducible data analysis.



Creation of static and interactive dataviz and dashboards, review of scientific figures.


Teaching & Training

Short talks or multi-day courses on dataviz, R, ggplot2, data analytics and more.



A few stories about statistics, R, dataviz. More or less linked with our world, always related to data

From Data to Viz - A classification of chart types based on input data format

July 2018 - 6 minutes read

I’m delighted to announce a new dataviz project called Data to Viz. It is a classification of chart types based on input data format. It comes in the form of a decision tree leading to a set of potentially appropriate visualizations to represent the dataset. - Read more

Pimp my RMD - A collection of tips for R Markdown

July 2018 - 2 minutes read

R markdown creates interactive reports from R code. I’ve created a document that provides a few tips I use on a daily basis to improve the appearance of my html outputs (my memory aid). This document is built using R Markdown and hosted on Github. - Read more


I've developed several websites dedicated to data visualization. These resources are visited about 30.000 times a day.

from Data To Viz

A classification of charts based on their input format, and a lot of tips and tricks.


Dataviz inspiration

A collection of my favorite dataviz project in a pinterest style.


R Graph Gallery

Hundreds of R charts, always with reproducible code and explanations.


Python Gallery

A gallery of charts made with python, with a focus on Matplotlib and Seaborn.


D3 Graph Gallery

D3 is the ultimate tool for data visualization on the web. Tedious but limitless.


React Graph Gallery

Learn how to integrate d3.js graphs with React, the most widely used Javascript library.



A glimpse of the projects I've been working on


Feel free to contact me for any question. For open source projects, please open an issue or pull request on Github. If you want to follow my work, reach me on Twitter. Otherwise, send me an email at yan.holtz.data@gmail.com.

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