Communications of the ACM cover: Facebook ad icon mosaic from thousands of people's photos. Charis Tsevis illustrates sensitive data advertising questions.

Joe Biden 2020 campaign mosaics by Charis Tsevis. Presidential portrait series supporting decency, science, and compromise. Democratic nominee.

Pete Buttigieg 2020 campaign: Charis Tsevis creates mosaic portraits and animations for Democratic primaries. Promotional artwork series.

Donald Trump mosaic portrait from USD banknote fragments. The Hollywood Reporter article on Hollywood wages.

Kellyanne Conway mosaic portrait. Dutch newspaper de Volkskrant Sunday edition. Alternative facts commentary.

Matteo Renzi mosaic portrait. Italian weekly magazine Panorama. Former prime minister.

Barack Obama mosaic portrait from numbers, statistics, and financial symbols. NY Observer article illustration.

Chinese flag mosaic from American products sold on Alibaba.com. Fortune magazine editorial illustration.

Abraham Lincoln mosaic from photos of 100 most significant Americans. Smithsonian special edition.

Rick Perry's mosaic from cowboy hats, boots, guns, and Texas symbols. National Journal cover.

Beppe Grillo mosaic from electoral campaign photos. Panorama magazine cover. 5 Stars Movement leader.

Osama Bin Laden's mosaic portrait. Shortlist magazine UK.

Barack Obama 2012 campaign artwork by Charis Tsevis. Posters for Democrats Abroad, Obama Portrait Project, grassroots initiatives.

Thomas Jefferson's twin portraits from the archives. Smithsonian special issue on the president's secrets.

Obama and Romney portraits from key people's photos. HUFFINGTON magazine. Democratic and Republican conventions.

Alexis Tsipras's mosaic from stars and flag-waving people. MONO magazine Greece. Syriza leader.

Barack Obama's 2008 campaign mosaics from supporters. Published in TIME, Los Angeles Times, Epoca. Democrats Abroad Greece.