Entrepreneur · Ironman · Builder

Stuart
Nixdorff

"Anything is Possible"

Deep-tech commercialization strategist, serial founder, board operator, published author, and lifelong endurance athlete. 9K+ miles run. 50K+ miles cycled. 18 Ironman finishes. Cape Cod to Kona and everywhere in between.

4X
Founder
18
Ironman Finishes
4,168
Logged Activities
60+
Countries Visited
304
Global Workout Locations
9K+
Miles Run
50K+
Miles Cycled
3M+
Air Miles Flown
3M+
Ski Vertical Feet
Athletic Career Ventures
Scroll
Who I Am

Builder. Thinker. Finisher.

Systems thinker with a bias toward action. I operate at the intersection of breakthrough science, strategic capital, and elite performance — in boardrooms and on race courses.

⚡
CEO & Operator

Deep-Tech Commercialization

I take breakthrough scientific and engineering innovations from lab to market. Specializing in semiconductors, photonics, optics, and AI-enabled products, I've scaled ventures from zero to funded to exit — operating across the full capital stack from seed to Series B+.

FundraisingBoard GovernanceExit StrategyEnterprise Sales
🔬
Investor

Deep-Tech Portfolio Operator

Active angel investor and LP across semiconductors, photonics, AI platforms, and frontier hardware. I evaluate opportunities on asymmetric upside, strategic leverage, and exit potential — and I use AI as a co-pilot across every investment thesis.

Angel InvestingOpticsAI PlatformsSemiconductors
🏗️
Builder

Companies, Products & Platforms

I've built companies from a blank page — developing product strategy, GTM playbooks, cap tables, and leadership teams. My operating model is hands-on at the executive layer, with a board director lens for governance, accountability, and strategic navigation.

GTM StrategyProduct DesignCap TableTeam Building
🌍
Global Citizen

Cape Cod · Sarasota · The World

Based between Cape Cod, Massachusetts and Sarasota, Florida. But equally at home on a starting line in Nice, a bike course in Roth, a trail in Patagonia, underwater in Raja Ampat, or on the slopes in Hokkaido. 3M+ air miles. 3M+ ski vertical feet. Endurance sport has taken me to every inhabited continent.

Cape Cod, MASarasota, FL60+ Countries3M+ Air Miles3M+ Ski Vert
Ventures & Boards

Active Positions

Operator-investor across a portfolio of deep-tech and AI ventures. Board-level accountability with hands-on commercial execution.

Board Director
Myrias Optics
Commercializing breakthrough meta-optics technology. Leading fundraising strategy, board governance, and enterprise customer development for this deep-tech photonics company transforming optics manufacturing.
Meta-optics · Semiconductors · Photonics
Board Member
Ada IQ
AI-powered product design platform enabling teams to build better products faster. Driving GTM strategy and enterprise positioning for this AI-native product intelligence platform.
AI · Product Design · Enterprise SaaS
Founder
Intervals.ai
GTM consultancy purpose-built for deep-tech founders. Turning world-class science into enterprise revenue — bridging the gap between laboratory breakthrough and commercial scale.
GTM Consulting · Deep-Tech · B2B Sales
Founder
DelayDenyDefend.com
Insurance advocacy platform with AI-powered tools helping policyholders navigate claim denials, delays, and systemic friction from insurers. Democratizing access to expert insurance advocacy.
InsurTech · AI Tools · Consumer Advocacy
Board Member
Wildlife Acoustics
Leading manufacturer of bioacoustic monitoring hardware and software for wildlife research and conservation. Products used by researchers, government agencies, and environmental consultants worldwide to detect and classify species by sound.
Bioacoustics · Hardware · Conservation Tech
Angel Portfolio
Deep-Tech Fund
Active angel and LP investments across frontier hardware, AI platforms, photonics, and defense technology. Thesis-driven portfolio focused on asymmetric upside and strategic exit potential.
Angel · LP · Frontier Hardware
Founder · Host
The Founder Series
Media platform and community for deep-tech founders navigating the commercialization gap. Content, conversations, and frameworks at the intersection of science, capital, and go-to-market execution.
thefounderseries.com · founderseries.media
Author

Written Work

From evidence-based sales frameworks for scientists and founders to high-concept fiction — the same pattern-recognition engine that drives business strategy powers the page.

Non-Fiction

STEM Selling

A practitioner's guide to early-stage commercial execution for deep-tech founders and scientists. Bridges the gap between technical credibility and enterprise revenue — built from two decades of commercializing breakthrough innovations.

PublishedSales MethodologyDeep-Tech
Full Catalog
Non-Fiction
STEM Selling
Non-Fiction
Hired for Scientists
Non-Fiction
FounderX Series
Fiction
Ghost Strike
Fiction
Iron Axe
Fiction
Hyde
Fiction
Deep Flight
Non-Fiction
10× Deep Tech Library
Global Travel

Trained on Six Continents

Endurance sport has been the vehicle for experiencing the world at ground level — with GPS-verified workouts in 60+ countries across every inhabited continent.

60+
Countries Visited
3M+
Air Miles Flown
3M+
Ski Vertical Feet
6
Continents Trained
🇺🇸 Cape Cod, MA
Home Base · 1,044+ activities
🇺🇸 Sarasota, FL
Second Home · 300+ activities
🇫🇷 Nice, France
IMWC 2023 & 2025
🇩🇪 Roth, Germany
Challenge Roth 2018
🇦🇺 Sydney, Australia
Ironman & Marathon
🇳🇿 New Zealand
Ironman NZ 2024
🇯🇵 Japan
Tokyo Marathon + Hokkaido Ski
🇵🇹 Portugal
Algarve & Lisbon Training
🇪🇸 Spain
Mallorca, Barcelona, Girona
🇲🇽 Mexico
Ironman Cozumel ×3
🇦🇷 Patagonia
PatagonMan 2025
🇧🇷 Brazil
Amazon + Rio + Florianópolis
🇿🇦 South Africa
Big Five Marathon · Kruger Safari
🇸🇬 Singapore
APAC Hub Training
🇻🇳 Vietnam
Da Nang & HCMC
🇰🇭 Cambodia
Angkor Wat Forest Cycling
🇬🇷 Greece
Santorini, Rhodes, Athens
🇵🇫 French Polynesia
Tahiti & Bora Bora
🇫🇯 Fiji
Open water & trail
🇵🇪 Peru
Machu Picchu Hike
🇫🇮 Finland
Helsinki training
🇨🇳 Great Wall, China
Historic hike
Athlete · GPS Data

Global Workout Map

Every dot is a GPS-verified workout. 4,168 activities. 304 unique locations. 15 years of Garmin data rendered in one view.

Use +/− buttons or pinch to zoom the map
Triathlon / Multi-Sport
Running
Cycling
Swimming
Alpine / Other
Circle size = activity count at location
18
Ironman Finishes
9K+
Miles Run
50K+
Miles Cycled
3M+
Ski Vertical Feet
304
Global Workout Locations
Race History

Key Races & Events

A lifetime of start lines — 18 Ironmans, marathons across six continents, and events that don't fit any category.

November 2012
Ironman Cozumel
📍 Cozumel, Mexico
Full Ironman · 140.6 mi
November 2013
Ironman Cozumel
📍 Cozumel, Mexico
Full Ironman · 140.6 mi
October 2013
Ironman Arizona
📍 Tempe, Arizona
Full Ironman · 140.6 mi
November 2015
Ironman Cozumel
📍 Cozumel, Mexico
Full Ironman · 140.6 mi
July 2015
Ironman Lake Placid
📍 Lake Placid, New York
Full Ironman · 140.6 mi
July 2016
Ironman Lake Placid
📍 Lake Placid, New York
Full Ironman · 140.6 mi
July 2018
Challenge Roth
📍 Roth, Germany
Full Distance · 140.6 mi
November 2018
Ironman Arizona
📍 Tempe, Arizona
Full Ironman · 140.6 mi
September 2019
Ironman Maryland
📍 Cambridge, Maryland
Full Ironman · 140.6 mi
November 2019
Ironman Florida
📍 Panama City Beach, FL
Full Ironman · 140.6 mi
April 2022
Ironman Texas
📍 The Woodlands, Texas
Full Ironman · 140.6 mi
August 2022
Ironman Mont-Tremblant
📍 Mont-Tremblant, Quebec
Full Ironman · 140.6 mi
October 2022
Ironman Barcelona
📍 Barcelona, Spain
Full Ironman · 140.6 mi
November 2022
Ironman Florida
📍 Panama City Beach, FL
Full Ironman · 140.6 mi
September 2023
IRONMAN World Championship
📍 Nice, France
World Championship · 140.6 mi
March 2024
Ironman New Zealand
📍 Taupō, New Zealand
Full Ironman · 140.6 mi
September 2025
IRONMAN World Championship
📍 Nice, France
World Championship · 140.6 mi
December 2025
Patagonman XTRI
📍 Patagonia, Chile
XTRI · Full Distance · 140.6 mi
May 2024
Ironman 70.3 Port Macquarie
📍 New South Wales, Australia
Ironman 70.3 · Half Distance · 70.3 mi
2025
Ironman 70.3 Portugal
📍 Cascais, Portugal
Ironman 70.3 · Half Distance · 70.3 mi
2023
Ironman 70.3 Florida
📍 Haines City, Florida
Ironman 70.3 · Half Distance · 70.3 mi
2022
Pilgrimman Triathlon
📍 Plymouth, Massachusetts
Half Triathlon · 70.3 mi
2021
Ironman 70.3 Florida
📍 Haines City, Florida
Ironman 70.3 · Half Distance · 70.3 mi
December 2021
Challenge Daytona
📍 Daytona Beach, Florida
Challenge Series · Half Distance · 70.3 mi
2020
Challenge Majorca
📍 Alcúdia, Mallorca, Spain
Challenge Series · Half Distance · 70.3 mi
2019
Firmman Half Triathlon
📍 Narragansett, Rhode Island
Half Triathlon · 70.3 mi
2018
Pilgrimman Triathlon
📍 Plymouth, Massachusetts
Half Triathlon · 70.3 mi
2018
Challenge Quassy
📍 Middlebury, Connecticut
Challenge Series · Half Distance · 70.3 mi
2016
Vineyard Half Triathlon
📍 Martha's Vineyard, Massachusetts
Half Triathlon · 70.3 mi
2016
Patriot Half Triathlon
📍 Sterling, Massachusetts
Half Triathlon · 70.3 mi
2016
Vineyard Half Triathlon
📍 Martha's Vineyard, Massachusetts
Half Triathlon · 70.3 mi
2015
Pilgrimman Triathlon
📍 Plymouth, Massachusetts
Half Triathlon · 70.3 mi
2015
Patriot Half Triathlon
📍 Sterling, Massachusetts
Half Triathlon · 70.3 mi
2014
Patriot Half Triathlon
📍 Sterling, Massachusetts
Half Triathlon · 70.3 mi
2014
Firmman Half Triathlon
📍 Narragansett, Rhode Island
Half Triathlon · 70.3 mi
2013
Ironman 70.3 Arizona
📍 Tempe Town Lake, Tempe, Arizona
Ironman 70.3 · Half Distance · 70.3 mi
2012
Pilgrimman Triathlon
📍 Plymouth, Massachusetts
Half Triathlon · 70.3 mi
2012
Ironman 70.3 Providence
📍 Providence, Rhode Island
Ironman 70.3 · Half Distance · 70.3 mi
August 2007
Timberman 70.3
📍 Lake Winnipesaukee, Gilford, New Hampshire
Ironman 70.3 · Half Distance · 70.3 mi
March 2, 2025
Tokyo Marathon
📍 Tokyo, Japan
Abbott World Major
September 28, 2024
Berlin Marathon
📍 Berlin, Germany
Abbott World Major
January 2024
Disney Marathon
📍 Walt Disney World, Florida
Marathon · 26.2 mi
2021
Disney Marathon
📍 Walt Disney World, Florida
Marathon · 26.2 mi
2018
Big Five Marathon
📍 Limpopo, South Africa
Safari Marathon · Big 5 Wildlife
January 2012
Disney Marathon
📍 Walt Disney World, Florida
Marathon · 26.2 mi
April 2008
Boston Marathon
📍 Boston, Massachusetts
Abbott World Major
October 2005
Chicago Marathon
📍 Chicago, Illinois
Abbott World Major
October 2004
Marine Corps Marathon
📍 Washington, D.C.
Marathon · 26.2 mi
2002
Mystic Marathon
📍 Mystic, Connecticut
Marathon · 26.2 mi
2015
Escape from Alcatraz Triathlon
📍 San Francisco Bay, California
Iconic · Open Water
2012
NYC Bike-Swim-Run-Swim-Run
📍 New York, New York
Multi-Sport · NYC
Completed
Great Wall of China Hike
📍 Beijing, China
Adventure · Historic
Completed
Machu Picchu Trek
📍 Cusco, Peru
Altitude Trek · Historic
Completed
Amazon River Expedition
📍 Amazon, Brazil
Expedition · Water
Completed
Galapagos Islands
📍 Galapagos, Ecuador
Trail & Swim · Eco
Recurring · 2018 & beyond
SOS Triathlon — Cape Cod
📍 Cape Cod, Massachusetts
Open-Water Multi-Sport
Recurring · New York
SOS Triathlon — New York
📍 New York
Open-Water Multi-Sport
2018 & 2023
Sea to Summit
📍 Adirondacks / New England
Swim · Bike · Run · Climb
Completed
Hokkaido Ski Expedition
📍 Niseko, Japan
Alpine Ski · Japan Powder
November 2025
El Tour de Tucson
📍 Tucson, Arizona — 102 miles
Gran Fondo · Century
2022
Gran Fondo Sarasota — 100 mi
📍 Sarasota, Florida
Gran Fondo · Century
2025
Horrible Hundred
📍 Clermont, Florida — 100 mi
Gran Fondo · Century
Recurring
Cape Cod Century
📍 Cape Cod, Massachusetts
Century · Home Course
Recurring
Girona Gran Fondo
📍 Girona, Catalonia, Spain
Gran Fondo · Epic Route
October 2025
Lisbon Century
📍 Lisbon, Portugal — 90+ km
Gran Fondo · Century
Underwater

Scuba Diving

From the Caribbean shallows to the Coral Triangle and Indian Ocean walls — 30+ years of diving across the world's premier dive destinations.

🏆 Bucket List Sites
Great Barrier Reef
Queensland, Australia — world's largest coral system
Raja Ampat
West Papua, Indonesia — highest marine biodiversity on Earth
Maldives — Scuba Spa
Indian Ocean — liveaboard & resort dive experience
Cozumel
Mexico — drift diving on Palancar Reef (also IM race site)
All Dive Locations
🐠 Caribbean
Most islands explored
🐠 Cozumel, Mexico
Palancar Reef system
🐠 Puerto Vallarta
Banderas Bay, Mexico
🐠 The Florida Keys
John Pennekamp + beyond
🐠 Bermuda
Wrecks & reef systems
🐠 South Shore MA
Home waters
🐠 Virginia
Atlantic coast diving
🐠 North Carolina
Graveyard of the Atlantic
🐠 Maldives
Scuba Spa liveaboard
🐠 Raja Ampat
Coral Triangle, Indonesia
🐠 Tahiti
French Polynesia
🐠 Fiji
Soft coral capital of world