An expert in post-quantum cryptography and advanced cryptographic systems, Marc has led secure protocol development for global enterprises and research institutions — translating complex risk into deployable trust.

Marc Manzano leads the cybersecurity group at Sandbox. His current research interests include post-quantum cryptography, lightweight cryptography, fully-homomorphic encryption, the intersection between machine learning and cryptanalysis, performance optimizations of cryptographic implementations on a wide range of architectures, and quantum algorithms. He has presented more than 25 articles at international conferences, published more than ten journal papers, and collaborated on several scientific books related to cryptography and computer networks security.

Over the past ten years, Dr. Manzano has led the development of many secure cryptographic libraries and protocols. Dr. Manzano was formerly a Senior Staff Software Engineer at Google, and before that, he was the Vice President of the Cryptography Research Centre at the Technology Innovation Institute, a UAE-based scientific research center. Prior to that, he held several positions where he was responsible for implementing pivotal cryptographic components of a variety of secure communication products, including an electronic voting platform.

A quantum computing expert turned cryptographic strategist, David specializes in understanding how systems break — and guiding organizations through safe, standards-aligned transition to post-quantum cryptography.

David Joseph gained a PhD at Imperial College London in quantum computing to break lattice-based cryptosystems. During this time he investigated methods derived from adiabatic quantum algorithms, implementing attacks on the D-Wave quantum annealer, and utilizing quantum machine learning techniques. In April 2020 David joined a Quantum&AI team inside of X, The Moonshot Factory at Alphabet, continuing to work at the interface of quantum computing and cybersecurity. There he started a group looking into the transition from quantum-vulnerable cryptography to PQC. He has remained a part of this team ever since, before joining SandboxAQ as a founding employee. David is an author of the Nature paper “Transitioning Organizations to Post-Quantum Cryptography”, published in May 2022.

A leading expert in post-quantum cryptography, Carlos has spent two decades advancing quantum-safe research and guiding global enterprises through cryptographic transition — strengthening the foundations of machine trust.


Based in France, Carlos brings a wealth of research, academic and practical experience to SandboxAQ. He has been working within the Post-Quantum Cryptography (PQC) domain as an academic for 20 years across numerous universities, including the very prestigious Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO). He was also a consultant for 10 years, working for companies such as Airbus and supporting two of the teams present in the third round of NIST’s PQC standardization. He is the co-inventor of a patent covering many of the existing PQC key exchanges, and the author of nearly 100 publications cited more than two thousand times. His contributions are pivotal to enhancing our work in different product areas. He is also responsible for PQC training, both internally and for our customers, and will be instrumental in recruiting future employees, advisors, academic collaborators, post-docs, PhDs and residents.