Valve
Valve isn't a fast-paced studio that churns out new titles every year, but it may not need to be. When Gabe Newell and his team begin work on a new project, the entire industry takes notice. That level of respect and status does not come easily. Years of dedication, passion, creativity and a focus on polish that is rarely seen in modern games are required.
Valve creates incredible games with lifespans that would make any "live service" salivate. Valve encourages competitors, modders, and other creative types to create experiences that pay homage to, or improve on, the studio's work in some way. And when you look at amazing games like Overwatch and Vermintide, which were inspired by TF2 and Left 4 Dead, respectively, you can't help but be thankful that Valve is still around and innovating, albeit slowly.
Detailed Information:
Founded: August 24, 1996
Genre specialty: Various
Notable franchises: Half-Life, Left 4 Dead, Team Fortress, DOTA
Website: valvesoftware.com/en