About Callum
Callum is an Investment Principal at Bullhound Capital. He joined the firm after finishing his PhD at the University of Cambridge, where he worked on developing semiconductor materials that could one-day underpin the quantum internet. Topics covered in his academic career were varied and broad, ranging from quantum and battery materials to data science and photonics. He’s published many high impact papers, receiving >150 citations and speaking at a host of the leading academic conference in his field. Always close to innovation, Callum has previously worked with Hummingbird Ventures and Funding Circle. Covering deeptech more broadly in the team he has led or supported our investments in Q-CTRL, Leolabs and Quantum Systems.
Investments
On Callum Stewart's radar
June 12, 2025
Scaling Groundbreaking Technology That Compresses LLMs by Up to 95%
Bullhound Capital Leads €189M Investment in Multiverse Computing
May 06, 2025
Accelerating Global Expansion and AI Leadership
Bullhound Capital backs Quantum Systems, Europe’s first dual-use tech unicorn, as it raises €160M in Series C funding
March 11, 2025
Integrating AI into business strategy
Beyond the Code – When engineers understand the practitioner
January 09, 2025
GP BULLHOUND RELEASES TECHNOLOGY PREDICTIONS 2025 REPORT