DC/OS is a distributed operating system based on the Apache Mesos distributed systems kernel. DC/OS can be used to automate resource management, schedule process placement, facilitate inter-process communication, and simplify the installation and management of distributed services. In the past, Mesos was famous for helping Twitter to eradicate the "Fail Whale." More recently, DC/OS has been adopted in production by high-profile companies such as Autodesk, Esri, Time Warner Cable, Verizon, and Wellframe. Until recently, however, Mesos did not support GPUs as an allocatable resource. Users that wished to use GPUs had to have separate GPU clusters outside of their primary Mesos or DC/OS installation. By adding first-class support for GPUs, companies can now leverage the power of the GPU in the same shared cluster as their other workloads. We'll introduce how we added support for GPUs to Mesos, including a demo of Tensorflow jobs running on a standard DC/OS installation.