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4557

Tristan Semmelhack

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Tristan Semmelhack
CEO & Co-Founder of
Reflect Orbital (2021)
About

Tristan is Co-Founder, CPO and CTO of Reflect Orbital, a space company building a constellation of satellites with large mirrors that reflect sunlight to Earth after dark.

Before founding

Tristan has been designing and building flying things since age 12, ran a drone airframe business called KittyhawkFPV, and interned at Zipline in high school. He later worked at Zipline as a mechanical design engineer, leading development of the Platform 2 Delivery Droid, and studied at Stanford and The Juilliard School.

Founder Insights

He took leave from Stanford in December 2022 to join Ben Nowack as co-founder, after first discovering Nowack through his BenNBuilds YouTube channel as a teenager. He also played violin at Juilliard.

Experience

Reflect Orbital raised a $6.5M seed round led by Shaun Maguire and Sequoia Capital in September 2024, followed by a $20M Series A led by Lux Capital in May 2025.

Scale & Impact

The company received over 260,000 requests for satellite-reflected sunlight from 157 countries and has targeted its first satellite launch for 2026. It has also received FCC approval to fly its test mission.

4557

Tristan Semmelhack

Reflect Orbital
Co-Founder, CPO & CTO
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Tristan Semmelhack

Company(s)

Reflect Orbital

Industry

Climate / Social Tech

Year Founded

2021

Stage/Funding

Series A • $35M

Company Location

us

Connect

About

Tristan is Co-Founder, CPO and CTO of Reflect Orbital, a space company building a constellation of satellites with large mirrors that reflect sunlight to Earth after dark.

Before founding

Tristan has been designing and building flying things since age 12, ran a drone airframe business called KittyhawkFPV, and interned at Zipline in high school. He later worked at Zipline as a mechanical design engineer, leading development of the Platform 2 Delivery Droid, and studied at Stanford and The Juilliard School.

Founder Insights

He took leave from Stanford in December 2022 to join Ben Nowack as co-founder, after first discovering Nowack through his BenNBuilds YouTube channel as a teenager. He also played violin at Juilliard.

Experience

Reflect Orbital raised a $6.5M seed round led by Shaun Maguire and Sequoia Capital in September 2024, followed by a $20M Series A led by Lux Capital in May 2025.

Scale & Impact

The company received over 260,000 requests for satellite-reflected sunlight from 157 countries and has targeted its first satellite launch for 2026. It has also received FCC approval to fly its test mission.

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