Marco Galletti “K” was born on the 28th of August 1987.
Graduated in art in 2005/2006, at IV Liceo Artistico Alessandro Caravillani in Rome. In high school he met the artist Paolo Aristi Cotani and worked as study assistant for two years.

In 2008 he enrolled in Rome's Academy of Fine Arts, but he quit in 2013. In the meanwhile, he entered the Roman art scene, attending the Elettronica Art Café of Umberto Scrocca and Achille Bonito Oliva.

Later, K. became a founding member of the collective "Monstrum" and participated in art exhibitions such as:

- "Mostrum", Space 3B by Alexander Bracci
- "Artisti nel chiostro", curated by Gino Taddei at the Cloister of the Basilica of San Giovanni dei Genovesi, with the partecipation of the 100 artists of Via Margutta
- "Abduction", Atelier Montez by Giorgio Capogrossi
- "Tinte Fresche", Rhode Island School of Design, curated by Baldo Diodato and Helen Driscol
When "Mostrum" broke up, K started his collaboration with Atelier Montez, participating in "Made in Rome", curated by Manuela Van Vannozzi, the charity auction "Artists for Philippines" (for the victims killed by the typhoon which devastated Philippines in 2016) and the second edition of the exhibition "Pagine Aperte" by Cristiano Quagliozzi. 
In 2016 he conceived and directed Persephone, a project that started as a huge exhibition dislocated in two locations: Spazio Incinque, in Via Madonna dei Monti and Atelier Montez, in Via di Pietralata , both in Rome.
The success of the exhibition suggested to shuffle Persephone into an audio-video work, realized in partnership with the performing duo "NiDuo" by Francesca Zavattaro and Antonio Cicerone. Later, K. conceived a third act for the performance, called "Return to the Goddess”, with the dancer Manuela Cirfera. The third act of Persephone has been presented at the Pietralarte Festival 2016, during the "Estate Romana".

Since 2018 Marco Galletti is a member A.C. Montez's CDO, as Production Director. He participated in artistic and performative projects with his colleague Gio Montez, like the Frankfurt Performance Festival curated by Dirk Baumanns, Juan Xu and Franziska Eissner.
Today he collaborates with the curator Marcella Magaletti.
Unconscious dragonfly - Thermic fused plastic and fluorescent pigments. Leght: 2000 mm. Year: 2013
Rochets - :Sculpture made of polyurethane and plastic, placed on a plexiglass base. Base diameter: 750 mm,  height 345 mm. Year: 2013
Le • bateleur - Mixed tecnique on paper. Base: 210 mm, heigth 295 mm. Year: 2015