Éder Rösner, CEO of Sinequanari Audiovisual, has a degree in Audiovisual Production from PUCRS (at Porto Alegre in Brazil) and was scriptwriter for the short films "Próprias Mentiras" (One’s Own Lies) and "Triângulo" (Triangle) during the course. In 2018, he completed a postgraduate degree in Specialization in Digital Game Development (emphasis on Game & Narrative Design) also at PUCRS and, at the end of the course, collaborated on the game "Lazarus' Valley" in the roles of game designer and narrative designer. Éder worked in the executive production team of the feature film "Tales of Tomorrow" (https://www.imdb.com/title/tt7283934/); the short movie "Stone Heart" (https://www.imdb.com/title/tt14691764/); the forthcoming 2nd season of the 3D animated kid's series "Lupita on the Planet of the Grown-Ups" (https://www.imdb.com/title/tt11755596/); among others titles still in development/production/post-production (all these as a collaborator of the company Druzina Content).

Currently, as a creator and scriptwriter in his own company, Sinequanari Audiovisual, Éder develops two fictional series projects (one being a neo-noir dramatic thriller and the other is a science fantasy, both of which attracted the attention of international players in business rounds), as well a interactive fiction game.