Team

Collaborative and dedicated to developing market-leading solutions, the OSL team are passionate about harnessing cutting edge technologies to create safer spaces. Protecting people, property and the planet through unparalleled visibility.
Senior Leadership Team
Mark Legh-Smith MBE
Chief Executive Officer and Founder
Established the company in 2010 after serving for 18 years as an officer in the British Army. Specialised in C2ISR and air defence, and recognised with an MBE.
Highly experienced in airspace, technology, security, and drone utilisation. Played a pivotal role in shaping the company's achievements with a proven approach that is instrumental in devising effective solutions for OSL's clients and partners in various sectors, including aviation, commercial, defence, and government.
Simon Trist
Chief Operating Officer
Joined OSL as COO in May 2023 to lead business transformation as well as commercial, operational, and technology delivery.
Experienced in technology and operations leadership roles within aviation, renewable energy, and smart cities businesses, providing solutions and services which improve safety, sustainability, and situational awareness for customers.
Daniel Carey
Chief Strategy Officer
Joined OSL in August 2021, initially as CFO, before transitioning to Chief Strategy Officer in 2024. He leads OSL’s corporate strategy, partnerships, and business development, ensuring the company’s long-term growth and market positioning.
With a background in M&A banking across technology, aerospace, communications, and industrial sectors, Daniel brings extensive experience in high-growth companies, private equity, and strategic transactions.
Andy Warren
Chief Financial Officer
Joined OSL in 2024 to lead the company’s financial strategy, corporate governance, and commercial operations.
With extensive experience in aerospace, technology, and high-growth businesses, he plays a key role in driving OSL’s financial planning, risk management, and international expansion.
His expertise ensures OSL remains financially agile and well-positioned to scale its cutting-edge CUAS solutions across global markets.
Sara Evans
Corporate and Commercial Director
Joined OSL in February 2021 with responsibility for commercial, corporate development, governance, HR, and legal. 15 years’ commercial experience in aviation, transportation, and mining in the UK, Europe, and Asia Pacific.
Dominic Walker
Business Development Director
Joined OSL in 2025 to lead the company’s business development strategy, including sales, marketing, and bid activities to deliver on ambitious growth targets.
Dominic has worked in the Aerospace and Defence sector for over 2 decades, holding senior positions with major primes including Northrop Grumman, QinetiQ and Thales. In 2018 he took the role of CEO of Aveillant, a specialist radar company based in Cambridge, UK, who developed one of the first dedicated civil counter-drone radars subsequently fielded at a number of international airports.
Dominic studied Natural Sciences at Christ's College Cambridge, holds a PhD in Electrical Engineering from University College London and an MBA from Warwick Business School.
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