Inkup | 4 followers on LinkedIn. Inkup is co-founded by three undergraduate students (Jon Grunewald, Bill Ke, and Sascha Maraj) at the University of Maryland. Inkup works to promote sustainability on campus while advocating for campus-wide public awareness about environmental responsibility. By providing a recycling and reusing ink cartridge service to the campus wide community, Inkup hopes to reduce the detrimental effect of plastics on our environment, as well as alert the public to environmental causes and to take action.