spacex-alum
(2)
Halen Mattison
Halen Mattison is the co-founder and CEO of General Galactic, an El Segundo space-propulsion company building Genesis, a water-fueled engine that aims to combine hydrazine-level thrust with xenon-level efficiency. A former SpaceX engineer who worked on propellant generation for Starship, he left after being told his Mars-fuel vision was too long-term, studied at Stanford, and started the company to build the propulsion and propellant infrastructure he believes will become a railroad to Mars. The company raised roughly $9.9M across pre-seed and seed rounds and first emerged converting CO2 into methane on Earth before sharpening its focus on high-agility spacecraft and water-based propulsion.
Laurence Allen
Laurence Allen is the co-founder and CEO of Terranova, a Berkeley-based startup building autonomous terraforming robots that lift flood-prone land out of harm's way by injecting wood waste slurry deep underground. A UC Berkeley Mechanical Engineering graduate (2024) who conceived the idea during a 2021 SpaceX internship, Allen launched the company — originally called Levitree — to save his own hometown of San Rafael, California, which floods to waist depth several times a decade. Terranova closed a $7M seed round in late 2025 at a $25.1M valuation led by Congruent Ventures and Outlander, and can lift one acre of land by one foot per day at a fraction of the cost of traditional seawalls. Allen was named to the 2026 Forbes 30 Under 30 list in Energy & Green Tech, took a leave from his Stanford master's program to scale Terranova full-time, and entered 2026 actively pursuing commercial elevation projects across the Bay Area for flood prevention, development, and wetland restoration.