Much of my publication has been on slavery and its demographic impact on Africa. Important in this analysis has been my demographic simulation of Atlantic the slave trade and other migration. A second edition of my 1990 Slavery and African Life, significantly revised, is in preparation.

Meanwhile, I am completing the analysis for a book entitled "African Population in the Slave-Trade Era," a detailed estimation of African populations as influenced by slave trade and other factors, from the seventeenth to twentieth centuries.

In an article drawn from work for that book, "African Population: Projections, 1850-1960," I have prepared new estimates for African population that accounts for colonial-era underestimates of African population size and overestimates of African growth rates. As a result, my estimates argue for a continental African population of about 150 million in 1850, in contrast to the previous estimates of 100 million.