Alex Tabarrok is a professor of economics at George Mason University. Some of his work is referenced on the website:

• He was a co-initiator of the Open Letter on Immigration addressed to the United States president, mentioned on the economist consensus page.
• His articles, Why Ruin the World’s Best Anti-Poverty Program?, and Economic and Moral Factors in Favor of Open Immigration.

Tabarrok also wrote The Case for Getting Rid of Borders—Completely, published in The Atlantic on October 10, 2015.

Relevant blog posts by Tabarrok:

• Open Borders Day! at Marginal Revolution, March 16, 2014, on the occasion of Open Borders Day.
• The Moral Is the Practical at Marginal Revolution, February 15, 2014, cited at moral versus practical arguments.