# Amir Ben-Efraim

> Amir Ben-Efraim is the co-founder and executive chairman of Menlo Security, following his tenure as CEO. Previously founder and CEO of Altor Networks, acquired by Juniper in 2010, he has built security businesses around shifts toward virtualization and cloud browsing. His background combines electrical engineering at Berkeley and Stanford with an MBA from UCLA.

- **Role:** Co-founder & Executive Chairman at Menlo Security Inc.
- **Organizations:** Menlo Security Inc., Altor Networks, Juniper Networks, Check Point Software Technologies, Amdahl
- **Education:** BS in Electrical Engineering, University of California, Berkeley, MS in Electrical Engineering, Stanford University, MBA, UCLA Anderson School of Management
- **Known for:** Co-founded Altor Networks, acquired by Juniper in December 2010., Co-founded Menlo Security and led it as CEO through its reported $100 million ARR milestone in 2024., Named among Goldman Sachs’ 100 Most Intriguing Entrepreneurs of 2021.

## Career timeline

- **1991** — Graduated from UC Berkeley with a BS in electrical engineering.
- **Early career; dates not established** — Worked on CPU simulation software at Amdahl; later worked in business development and partnerships at Check Point.
- **2007** — Co-founded Altor Networks and served as CEO.
- **2010** — Juniper acquired Altor on December 6 for approximately $95 million cash, net of shares already owned; Ben-Efraim joined Juniper.
- **After the Altor acquisition** — Served as vice president of cloud security at Juniper Networks.
- **2013** — Co-founded Menlo Security; founding year follows the company corporate fact sheet.
- **2015** — Menlo publicly emerged from stealth with its isolation approach.
- **2020** — Led Menlo during a $100 million Series E at an $800 million company valuation.
- **2021** — Selected for Goldman Sachs Builders + Innovators recognition.
- **2024** — Menlo launched its Secure Enterprise Browser offering in February and announced over $100 million ARR in October.
- **2025** — Berkeley records his Founders’ Pledge as fulfilled.
- **2026** — Bill Robbins succeeded him as CEO on February 25; Ben-Efraim continued as executive chairman.

## Achievements

- Co-founded Altor Networks, acquired by Juniper in December 2010.
- Co-founded Menlo Security and led it as CEO through its reported $100 million ARR milestone in 2024.
- Named among Goldman Sachs’ 100 Most Intriguing Entrepreneurs of 2021.
- Fulfilled the Berkeley Founders’ Pledge in 2025.

## Latest updates

- **2026-02** — Menlo announced Bill Robbins as CEO on February 25; Ben-Efraim continued as executive chairman. The company reported more than $140 million ARR in its fiscal year ending January 2026.
- **2025-04** — Discussed existing-browser security, company development and future ambitions in a Pulse 2.0 interview.

## Links

- Website: https://www.menlosecurity.com/
- LinkedIn: https://www.linkedin.com/in/amir-ben-efraim-8801451

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Profile page: https://yespress.io/amir-ben-efraim
Published by YesPress — https://yespress.io
Last updated: 2026-10-15