Ruggero Freddi (born October 6, 1976) is an Italian mathematics lecturer and former gay pornographic film actor known professionally as Carlo Masi.

[5][3] In 2003, Masi completed a Master of Science (MSc) degree in computer engineering[6][7][8] at the Sapienza University of Rome and worked in an artificial intelligence laboratory.

[9][10] In 2004, after being contacted by a Colt Studio Group (CSG) recruiter, he made his debut in the gay pornography industry participating in his first porn movie, Big N 'Plenty.

[11][3] In 2006, he was selected to appear on the cover of COLT 40,[12] a coffee table book published to celebrate the fortieth anniversary of the production company.

[13] In 2007, Masi and his future husband, Adam Champ (Gustavo Leguizamon [Wikidata]), were selected to appear on the cover of the Damron 2007 Men's Travel Guide.

[39][8][3] In 2020, he completed a Ph.D. in Mathematical Models for Engineering, Electromagnetism and Nanosciences at Sapienza University of Rome focusing on the application of Morse theory to a Dirichlet problem traced back to Poisson equations.

[48] In 2020, writer Strega Prize winner Walter Siti [it] published La natura è innocente – Due vite quasi vere.

[50] In 2023, he returned to the media spotlight, after winning a lawsuit for unfair dismissal against his former employers at the Sapienza University of Rome because they fired him without cause and refused to pay him for work done in 2019.