What Tom Percy Just Got Right About Integrating the Lunar Landing System

Who Is Tom Percy, and Why Does His Role Matter Right Now?

Tom Percy is the manager of systems engineering and integration for NASA's Human Landing System (HLS) Program — the office that determines whether the Artemis crewed lunar landers actually work together as a coherent architecture. Percy's job is not to build a rocket or design a lander; it is to serve as the technical spine connecting NASA and its commercial providers, chiefly SpaceX, into a single operable system. In a program where a missed interface definition can cascade into a mission abort, that role is arguably the most consequential engineering seat in the Artemis stack. NASA (2025-01-01) documents Percy's function precisely: he is "a focal point in working with providers" on the HLS Program.

What exactly does a Human Landing System integration manager do?

Systems engineering and integration (SE&I) is the discipline of ensuring that independently developed components — from SpaceX's Starship HLS to NASA's surface suits and communication protocols — share coherent interfaces, margins, and failure modes. Percy's team owns the interface control documents, the verification and validation matrix, and the cross-provider trade studies that no single contractor can resolve alone. In a program with at least two distinct commercial lander providers, the SE&I manager is the one person who must hold a complete, consistent picture of what plugs into what, at what voltage, pressure, data rate, and mass budget. Without that function executing well, the program accumulates silent technical debt that surfaces only during integrated testing — or worse, on the lunar surface.

NASA (2025-01-01) confirms Percy carries that exact responsibility, coordinating across providers to keep the HLS architecture coherent as NASA increases Artemis mission cadence toward sustained lunar presence.

The contribution that earns this week's spotlight

Percy's work intersects directly with the surface-power problem that sits at the heart of this publication's beat. Every kilowatt delivered to the lunar surface — whether from a fission surface power unit, a solar array, or a power-beamed relay — must be received by hardware that the HLS integration framework has already validated for interface compatibility. If the SE&I architecture is weak, a power system that works in isolation fails at the lander-to-surface handoff.

This is not hypothetical. Engineers at NASA's Lunar Development and Test Facility at Johnson Space Center are actively stress-testing Artemis hardware against lunar dust, one of the most destructive environmental factors for electrical connectors and solar panel surfaces. NASA (2025-01-01) describes lunar dust as "sharp, abrasive, and cling[ing]" — properties that degrade photovoltaic efficiency, jam connectors, and erode seals over timescales measured in EVAs rather than years. Percy's integration work determines which of those tested components make it into the verified HLS interface baseline. That is a direct line between his desk and the watt-hour budget available to the first Artemis surface crews.

Separately, the National Space Society (NSS) has publicly welcomed NASA's proposed PROMISE lunar lander concept, which would expand "scientific access, mobility, and capability across the lunar surface." National Space Society (2025-01-01) If PROMISE progresses, Percy's HLS SE&I office will face a third provider integration challenge — making the case for a robust, well-funded integration function even stronger.

Why this matters to readers making decisions this week

For investors and program officers evaluating surface-power bets, the integration layer Percy manages is the critical path that determines whether your power system reaches the lunar surface as designed. A kilowatt-class fission unit or a 10 kW solar array means nothing if the lander interface that receives it has not been verified against the HLS architecture. Percy's team is the gatekeeper for that verification.

For engineers building power conversion, distribution, or beaming hardware targeted at Artemis missions, the actionable takeaway is straightforward: interface early with the HLS SE&I baseline. Percy's role exists precisely to absorb that complexity before it becomes a late-stage incompatibility. His team publishes interface control documents; engaging with those documents now, while the architecture is still fluid, costs far less than a redesign after the verification matrix is locked.

Tom Percy is doing the unglamorous, load-bearing work that turns a collection of impressive hardware demonstrations into a mission that actually lands — and powers — humans on the Moon.