Joel Le Forestier


I research how people experience and navigate intergroup contexts, how to leverage insights from intergroup research to solve real-world problems, and the quantitative methods we use along the way.


The primary goal of my research is to understand the factors that shape people’s experiences in intergroup contexts and diverse societies. Much of my research examines how members of stigmatized groups respond to the experience of stigmatization through concealment. This has included the impacts of subjective identity concealability on people’s feelings and interactions (Le Forestier, Page-Gould, Lai, & Chasteen, 2022; Le Forestier, Page-Gould, Lai, & Chasteen, 2020) and perceivers’ appraisals of those who conceal (Le Forestier, Page-Gould, & Chasteen, in press). In ongoing research, I am examining predictors of concealment behavior and the contributions of distinct concealment-related processes to the consequences of concealment.Additional ongoing research examines stigmatized and non-stigmatized people’s responses to instances of intergroup conflict and recent research examined the relationship between regional-level racial bias and racial disparities in police behavior (Ekstrom, Le Forestier, & Lai, in press).


One line of research involves developing and testing theory-based interventions for prejudice reduction and attenuating the costs of stigma. Ongoing prejudice-reduction work includes a comparative investigation of multiple interventions to reduce implicit bias and a field intervention testing the effects of intergroup contact through social media. A recent intervention administered at scale and in the field reduced the weight-based academic achievement gap through social-belonging (Logel, Le Forestier, Witherspoon, & Fotuhi, 2020).


I study the conditions under which we can draw valid conclusions from our data and develop tools to help researchers conduct rigorous research. One current project involves the development of methods and tools for power analysis for sets of statistical tests (Le Forestier, Page-Gould, & Chasteen, under review), including the development of an R package, SimulPower (Le Forestier, 2020).

Journal Articles: Published / In press

Le Forestier, J. M., Page-Gould, E., & Chasteen, A . L. (In press). Concealment stigma: The social costs of concealing. Journal of Experimental Social Psychology. DOI: 10.1016/j.jesp.2022.104340

Ekstrom, P., Le Forestier, J. M., & Lai, C. K. (In press). Racial demographics explain the link between racial disparities in traffic stops and county-level racial attitudes. Psychological Science. DOI: 10.1177/09567976211053573

Le Forestier, J. M., Page-Gould, E., Lai, C. K., & Chasteen, A. L. (2022). Subjective identity concealability and the consequences of fearing identity-based judgment. Personality and Social Psychology Bulletin, 48, 445-462. DOI: 10.1177/01461672211010038

Logel, C., Le Forestier, J. M., Witherspoon, E. B., & Fotuhi, O. (2021). A social-belonging intervention benefits higher-weight students' weight stability and academic achievement. Social Psychological and Personality Science, 12, 1048-1057. DOI: 10.1177/1948550620959236

Le Forestier, J. M., Page-Gould, E., Lai, C. K., & Chasteen, A. L. (2020). Concealability beliefs facilitate navigating intergroup contexts. European Journal of Social Psychology, 50, 1210-1226. DOI: 10.1002/ejsp.2681

Journal Articles: In Prep / Under Review

Kawakami, K., Williams, A., Pek, J., Page-Gould, E., & Le Forestier, J. (Revise and resubmit). Analyzing relative attention to the eyes of Black and White faces. Journal of Personality and Social Psychology.

Le Forestier, J. M., Page-Gould, E., & Chasteen, A . L. (Under review). Statistical power for a set of tests.

Le Forestier, J. M., Page-Gould, E., & Chasteen, A . L. (In prep). Individual differences in identities' concealability and perceivability.

Book Chapters

Chasteen, A. L., Schiralli, J. E., Le Forestier, J. M., & Erentzen, C. (In press). Age stereotypes and ageism as facets of subjective aging. In Y. Palgi, A. Shrira, & M, Diehl (Eds.), Subjective views of aging: Theory, research, and practice. New York, NY: Springer.

Chasteen, A. L., Bergstrom, V. N. Z., Schiralli, J. E., & Le Forestier, J. M. (2019). Age stereotypes. In D. Gu & M. E. Dupre (Eds.), Encyclopedia of gerontology and population aging. New York, NY: Springer. DOI:

Initiation of Intergroup Contact

A seven-item measure originally used in Le Forestier, Page-Gould, Lai, & Chasteen (2020) to assess participants' proclivity to initiate contact with outgroup members.

Situational Avoidance

A three-item measure originally used in Le Forestier, Page-Gould, Lai, & Chasteen (2022) to assess participants' proclivity to avoid otherwise-desirable activities on account holding of a specific identity.

Subjective Identity Concealability

An eight-item measure developped and validated in Le Forestier, Page-Gould, Lai, & Chasteen (2022) to assess individual differences in participants' beliefs in the concealability of their own identities.


Calculate statistical power to simultaneously detect a set of effects.

Pride Palettes

Color palettes based on Pride flags.

Toronto Covid-19 Neighbourhood Data Visualizer

Explore factors that predict the prevalence of Covid-19 in Toronto's neighbourhoods.


SimulPower is an R package for simulating simultaneous power for a set of statistical tests.SimulPower is a work-in-progress. The current version is Version 0.8.0, updated in July 2021. While you may feel free to use it, please also check back for updates in the future. If you have feedback, I'd love to hear it via email!

Installing and using SimulPower

Information for installing and using SimulPower can be found here.

Citing SimulPower

When you use this function (and we hope you do!), please cite the package:Le Forestier, J. M. (2020). SimulPower: Simultaneous power analysis for a set of statistical tests. cite the accompanying paper:Le Forestier, J. M., Page-Gould, E., & Chasteen, A. L. (Under review). Statistical power for a set of tests.

Pride Palettes

PridePalettes is an R package that provides you with Pride flag color schemes to use in your R plots. It also comes with pre-made Pride flags using ggplot2.

Installing Pride Palettes

Step 1:
Install the devtools package, which allows you to install packages from GitHub, if you don't have it installed already.
install.packages("devtools")Step 2:
Install PridePalettes.

Using Pride Palettes

Step 1:
Load the PridePalettes package.
library(PridePalettes)Step 2:
Make your graph!
The pride_palette function returns character vectors of HEX codes representing colors on the Pride flag of your choice, in the order they appear on the flag. So, supplying it to whatever arguments in your graph require a list of colors will color your graph like the flag. For example, the following code creates a bar chart using the colors from the Philadelphia People Of Color Pride Flag:library(ggplot2)means <- c(1, 2, 3, 4, 5, 6, 7, 8)
groups <- c("1", "2", "3", "4", "5", "6", "7", "8")
data <- data.frame(means, groups)
ggplot(data = data, mapping = aes(x = groups, y = means)) +
geom_col(aes(fill = groups)) +
scale_fill_manual(values = pride_palette("philly_poc_pride"))
PridePalettes also includes the flag function, which generates pre-made Pride flags using ggplot2. For example, the following code generates the Trans Pride Flag:flag("trans_pride")For additional guidance and a full list of available palettes, refer to each function's help page:?pride_palette

Color Blind-Friendly Pride Palettes

While PridePalettes is primarily intended for use as a novelty, anyone who uses it for data visualization they intend to share with others should be mindful that not all Pride flags translate into in color blind-friendly palettes. However, some do! Those using Pride Palettes for data visualization are encouraged to choose from the following list of flags that are color blind-friendly for three of the most common forms of color blindness (i.e., protanopia, deuteranopia, and tritanopia).

  • Agender Pride Flag

  • Aromantic Pride Flag

  • Asexual Pride Flag

  • Genderqueer Pride Flag

  • Nonbinary Pride Flag

  • Pansexual Pride Flag

  • Trans Pride Flag