Building a business isn’t just about ideas; it’s about the people who bring them to life and the technology that amplifies their vision. Together, they turn challenges into opportunities.

Danielle Ullner

EY-Parthenon Senior Venture Builder – Industrials and Energy Venture Lead, Ernst & Young LLP

Operator, investor, builder and scaler. Mentor and advocate. Girl mom.

Danielle is a senior venture builder and the Industrials and Energy Venture Lead on the EY-Parthenon Venture Building team, our end-to-end business building practice. With a global career, she has demonstrated success in launching groundbreaking products, services and businesses for leading corporations and startups.

She has built and scaled many corporate-backed, venture-funded and private equity-backed ventures. Beyond launching companies, Danielle has held operational and board roles in early-stage startups and served as an operating partner with multiple venture capital firms.

Danielle’s diverse early-stage business building and innovation experience spans various industries, including power and utilities, oil and gas, industrials and financial services.

She is knowledgeable in business model innovation, early-stage venturing, going to market and partnerships.

Danielle is a Finance Fellow with the Aspen Institute and a member of the Aspen Global Leadership Network. She has an MBA from Harvard Business School and a BS (with distinction) from Cornell University.

How Danielle is building a better working world

Danielle is committed to shaping a better working world, both in everyday interactions and through transformative ventures. She is passionate about mentorship, team building and fostering innovation that drives meaningful impact. Big picture, she is dedicated to helping clients develop the conviction and capability to build transformative businesses they once thought impossible. In the day to day, she leads with authenticity — bringing her whole self to work and encouraging her teams and clients to do the same. By fostering an environment of trust, collaboration and resilience, she helps create a culture where innovation thrives, teams feel empowered and bold ideas turn into lasting impact.

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