[9] Prior to joining Uber, Greenberg served as Corporate Vice President at Microsoft and acted as director of development for Microsoft Azure, a cloud computing infrastructure platform that coordinates data centers around the world.

[13][14] He oversaw development of technologies that keep the network running in the cloud, so that when component failures happen, software systems pinpoint the failures and "route around the faulty components;" the technology permits data centers to be "software-defined", allowing the cloud to grow rapidly while being flexible to meet changing needs, as he explained in 2015 in eWeek magazine.

[6] Greenberg received his PhD in 1983 at the University of Washington as an ARCS Scholar (Seattle Chapter).

"[2] In addition, he publishes in numerous scholarly journals on topics such as networking and cloud computing.

[6] In 2016, he was inducted into the United States National Academy of Engineering for "contributions to the theory and practice of operating large carrier and data center networks.