Meet Marian Croak: The Woman Engineer Behind Your Internet Calls

From Bell Labs to Google: Marian Croak’s Engineering Career

Marian’s professional career started in 1982 when she joined Bell Labs (later AT&T), working in the Human Factors research group. In the early days, she was involved with the research into the uses of technology in making people’s life more comfortable. Later on, she moved on to the field of network engineering, where she began conducting research in the potential uses of digital telecommunication technology.

In the early stages of her research, traditional telephone networks and internet data, networks used separate infrastructure. However, she realized the potential of implementing internet protocols for digital communication thus unifying voice and data on one network. Despite its obvious advantages, the idea was not well-received. The voice communication based on the internet had some technical difficulties connected with reliable connection, sound quality and capacity. Moreover, there were concerns about the reliability of such communication compared to traditional telephone communication.

“Just keep going. Don’t listen to them, just keep going as fast as you can,” an executive from AT&T had motivated Marion, when she was struggling to make her network concepts accepted in the organization.

Currently Marian serves as the Vice President of Engineering at Google, heading the Research Center for Responsible AI and Human Centered Technology at Google.

Marian Croak’s Contributions to VoIP Technology

"Many people think inventors have to be brilliant and off the charts in terms of their IQ, super smart and super academic in school and have gotten all A's, and that's not at all true. Inventors are usually people like you. Sometimes they're good at certain things, other times they're not, and that's ok. Just focus on what you want to change and you become that change and can make that change happen," Marian.

Marian’s research and developments in VoIP have been some of the most remarkable contributions made in the field of engineering during her career. VoIP enables people to make voice calls through the internet by converting voice data into digitized data, which is then transmitted through internet protocol (IP) networks rather than telephone lines. Her innovations have set the foundation for modern communication technologies such as Zoom, Skype, and WhatsApp widely used today.

Marian may not have invented internet calling alone, but her engineering expertise has contributed towards making VoIP technology more viable and effective. Through her work, she and other engineers have helped improve the utilization of TCP/IP protocols for carrying voice traffic.

Voice traffic over digital networks has laid the groundwork for internet calling, audio conferencing, and video communication. Marian has been influential in developing the technology behind VoIP and making internet communication more reliable. Along with other researchers and engineers, she has helped develop the merging of voice and data networks, enabling the evolution of communication through internet protocols rather than phone lines.

Despite the doubts surrounding internet communication both technologically and commercially, she kept pushing for this kind of communication at AT&T. With time, the evolution of the technology created room for internet calling and conferencing which enabled communication beyond the geographical boundaries.

In her 32 years at AT&T and Bell Laboratories, she was awarded over several patents, including patents related to internet protocol and VoIP. At a point, she became the Senior Vice President of Applications and Services Infrastructure and managed over 2,000 engineers and computer scientists in various programs. Her efforts contributed towards the overall engineering advancements that have seen digital communication become a common part of our lives.