I am an assistant professor in the Department of History and Art History at George Mason University, working on digital history and the history of American religions. You can write to me at lincoln@lincolnmullen.com.

Most recent blog posts

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Visualizations and Digital Projects

The Spread of U.S. Slavery, 1790–1860

Mapping the population of enslaved and free African Americans before the Civil War.

Spread of slavery map

Gender Predictor

Predict your gender from your first name and birth year using historical data.

Gender Predictor thumbnail

Divergence in U.S. Sex Ratios by County, 1820–2010

Counties that were disproportionally male or female over time, based on U.S. Census data.

Diverging sex ratios map

Paulist Missions, 1851–1906

Locations and statistics of missions preached by the Missionary Priests of St. Paul the Apostle during the nineteenth century.

Paulist Missions map

Historical Boundaries of the United States, 1783–1912

The political boundaries of the United States on each date from 1783 to 1912.

Historical boundaries map

The American Converts Database

A database of converts and conversions in American religious history.

Historical boundaries map

All research projects →