JAYSHREE ULLAL

Jayshree Ullal was born in London in 1961 and grew up in New Delhi, India. She came to the United States and studied engineering.

She spent her early years at chip companies like AMD and Fairchild before networking became her world. In 1993, Cisco bought a startup she was at called Crescendo Communications, and she joined Cisco.

Over the next 15 years she ran its switching and data center business, growing the Catalyst product line into a roughly $10 billion operation. In 2008 she made the leap.

She left Cisco to become CEO of Arista Networks, a small startup founded by Andy Bechtolsheim and David Cheriton. She has run it ever since.

Ullal runs Arista Networks, which makes the switches and software that move data around inside massive cloud data centers. In plain English, when Microsoft or Meta builds a data center the size of a stadium, they need gear to shuttle information between thousands of computers at insane speeds.

Arista sells that gear. The company went public in 2014.

Its biggest customers are the cloud giants, which is both its strength and its risk, since losing even one of them stings. She also served on the board of Snowflake, the data company, for years.

Ullal is an operator who bets on big technical shifts before they are obvious. Her core insight at Arista was that the future of networking was software, not just hardware.

Most networking gear used to be a closed box you could not change. Arista built its switches to run flexible, programmable software on top of standard chips anyone could buy.

That made the gear cheaper to build and easier to upgrade. She bet that cloud companies would want that openness.

She was right, and Cisco spent years playing catch-up.

Arista itself is the win. When Ullal took over in 2008, it was a startup with a handful of people and a big idea.

She took it public in 2014. Today Arista is worth tens of billions of dollars and sells to the largest cloud companies on Earth.

The win is sweeter because she built it by beating Cisco, her former employer of 15 years, in a market Cisco thought it owned. She turned her own deep knowledge of Cisco's playbook into the blueprint for beating it.

That is how she became one of the wealthiest self-made women in America.

Arista's heavy reliance on a small number of giant customers has always been the soft spot. For years, just a couple of cloud companies, mainly Microsoft and Meta, made up a huge chunk of Arista's sales.

When those customers slow their spending, Arista's numbers wobble and the stock drops. The company has worked to spread its customer base since, but the concentration risk is real.

There was also a long, costly patent fight with Cisco in the 2010s that dragged on for years and cost both sides real money. Picking a fight with your old employer is satisfying, but it is not free.

Ullal believes in focus over sprawl. Arista could have expanded into a dozen markets but mostly stayed in its lane of high-speed data center networking.

She believes in keeping a company lean and profitable rather than chasing growth at any cost. She also believes deeply in betting on the right people.

She has said one of the biggest draws of joining Arista was that it was small, entrepreneurial, and full of people she already knew and trusted.

Ullal was born in London in 1961 and raised in New Delhi, India. She moved to the United States for university and built her entire career here.

She is married and has two daughters. She has spoken about how much she and her husband prioritized family right alongside their careers.

She is famously private about her personal life. For a CEO worth billions, she gives away almost nothing to the press about how she actually lives.

Ullal earned a bachelor's degree in electrical engineering from San Francisco State University. She later added a master's in engineering management from Santa Clara University.

She has said she was always drawn to the logical subjects like math, physics, and chemistry. Engineering was the natural path, and it gave her the technical depth to lead networking companies for decades.