A bookshelf, not a magazine.

The portfolio, in three sites

Felix's work lives on three surfaces, on purpose:

• felixlenhard.com is the personal record. Speaking, the long story, the working journal.
• vulpine-industries.com is the consulting umbrella. Subtraction Audits and the work with founders and innovation teams.
• vulpinehorizons.com is this site. The books and what grows out of them.

Three rooms in one house. The split exists so each room can do one thing well, and so this site can stay a quiet, well-bound shelf rather than a feed.

What sits on the shelf

Subtract to Ship is the four-volume method (Validate, Build, Grow, Scale), releasing September 15, 2026. It is the book version of the methodology Felix has used for twenty years across innovation consulting, twelve shipped and exited products, and a hundred-plus coached startups.

Build MDR and Scale eCommerce & Marketplace are domain extensions of the same method. Build MDR (with Tibor Zechmeister of Zechmeister Solutions) is for medical-device companies pursuing EU MDR certification, where the cost of additive thinking is measured in years lost to the audit cycle. Scale eCommerce & Marketplace applies the method to the SKU, channel, and operating decisions that make or break a scaling eCommerce business.

Late to the Table and Back at the Table are a different thread on the same shelf. Felix's two-volume memoir and masterclass on adult-discovered magic, the rabbit hole that started with a deck of cards in a hotel room and ended with co-founding Vulpine Creations and bringing the oldest performing art into the keynote work. They sit alongside the business books, not underneath them.

How to work together

Not sure which book to start with? The reading order guide will point you to the right volume for your situation.

For consulting and Subtraction Audits, head to vulpine-industries.com. For keynotes and workshops, the page lives on felixlenhard.com. For everything else (books, courses, the journal, reader mail), this is the right address.