Mark Sierra

Fractional CFO at WitnessAI

📍 Mountain View, California, United States

Mark Sierra is a Fractional CFO who specializes in scaling AI and SaaS startups from Seed to Series B stages. His career includes leading finance for Metas Reality Labs (Oculus VR) and investment banking. He is a graduate of the University of Southern Californias Marshall School of Business.

Outside of his professional work, Mark is dedicated to community service and youth mentorship. He actively volunteers his time with the Big Brothers Big Sisters of America organization, demonstrating a clear passion for giving back.

He previously managed the finance operations for Metas multi-billion dollar Reality Labs division, overseeing the strategy for Oculus VR.

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Current Role

Fractional CFO

Job Level

Leadership

Location

Mountain View, California, United States

Personality Overview

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Priorities

Topics Mark cares about

AI & SaaS Scaling

His professional focus is on guiding AI and SaaS companies through the critical growth phases between Seed and Series B funding rounds.

Tech Finance Strategy

His background in investment banking and as Head of Finance for Meta's Reality Labs highlights his expertise in high-level financial strategy for major tech ventures.

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Career

Work history

Fractional CFO

WitnessAI

In the press

Media appearances

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Education

Mark has no verified education history

Social presence

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