Vulpine Horizons · The Publishing Imprint of Felix Lenhard
Books on getting products and services to market — by removing what doesn't work.
Home of Subtract to Ship — a four-volume working manual on bringing real products into real customers' hands, faster, by finding the few things blocking the launch and removing them.
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20
years innovation consulting
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100+
startups coached
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12
products shipped & exited
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8
volumes in print 2026
Client teams Felix has worked with
- RHI Magnesita
- Magna
- voestalpine
- Liebherr
- Porsche
- ZF
- Lenze
- World Bank
The Series
Subtract to Ship.
Four volumes. One method.
The four-volume working manual on bringing products and services to market under real-world constraint — Validate, Build, Grow, Scale. Releasing September 15, 2026.
The Through-Line
"Subtract to Ship" in eighty words.
Across two decades of innovation work and a hundred-plus startups coached, the pattern was always the same: the products that reached customers had less in them, not more. Subtract to Ship is the method that came out of that work — find the three to five things blocking your launch, remove them, defend the removal, get the product to market.
Shipping, in this method, means one thing: a real product or service in real customers' hands. Not a deck. Not a pilot stuck in QA. Not a feature flag waiting on legal.
Read the full methodFrom the Journal
Field notes between the books.
The Horizons Letter
One short letter when something worth shipping appears.
New chapters, talk dates, and field notes from the work. No filler, no funnels.