The long run
I have run marathons in Austin, New York, and Jersey City, and I am usually mid-training for the next one. The miles are where most of my thinking gets done.
Strategic Finance at AmazonJersey City, New Jersey
Tony Segreto
I work on the economics of fast delivery at Amazon. Outside of that, I build software, write, and train for the next marathon.
Same-day
The delivery speed I model at Amazon
5AM
When the training and the building happen
26.2
Marathons in Austin, New York, and Jersey City
Murph
Every Memorial Day, vest on
Finance, software, writing, running, and the occasional superhero race shirt.
01 About
I work on the economics of getting packages to people faster, and I spend my early mornings proving a dad can still train for a marathon.
At Amazon I am a Finance Manager for New Speed Programs and SSD Operations Integration. I own the financial strategy and long-term modeling behind our fastest delivery experiences: how to scale capacity before demand arrives, how to price the customer experience, and how to tell whether the returns are worth the investment.
Outside of work I build software, write about technology and the way I get things done, and train through whatever injury I happen to be nursing. Most of it traces back to becoming a dad and learning how to chase hard things without losing sight of the people they are for.
02 Selected Work
View resume01Book + companion siteMarathon DadA training guide and memoir about running 26.2 as a new dad. I wrote it, designed it, and self-published it.Writing and design02iOS appBaby Feeding TrackerA small app for new parents that I designed, built with AI, and shipped on my own.Product and build03EssaysWriting on AI and WorkAn ongoing series on operating manuals, persistent memory, and getting real work out of AI agents.Writing
The Book
Read Marathon DadMarathon Dad
Training for a marathon is hard. Training for one with a newborn asleep on your chest is another thing entirely. Marathon Dad is the book I went looking for and could not find, so I wrote it.
It is a training plan and an honest account of chasing 26.2 without giving up the things that matter. I designed every page and published it myself.
A memoir
Marathon
Dad
Training for 26.2 with a newborn in your arms.
Tony Segreto
26.2
03 Writing
Latest essays from Substack, pulled from the publication RSS feed when the site renders.
Follow on SubstackSubstack / Apr 20, 2026Stop Asking AI Questions. Start Giving It Work.Agents don’t just respond, they do the workRead essaySubstack / Apr 16, 2026Building a Personal AI TeamSpecialized setups outperform general-purpose assistantsRead essaySubstack / Apr 9, 2026The Case for AI That RemembersPersistent context changes the economics of working with AIRead essaySubstack / Apr 7, 2026From Prompts to Operating ManualsHow the most useful form of AI isn’t a conversationRead essay
04 Beyond Work
The Murph
Every Memorial Day: a mile, a hundred pull-ups, two hundred push-ups, three hundred squats, and another mile, with a weight vest on.
Family and Valheim
When the laptop closes, I am a husband and a dad first. What is left over tends to go toward building longhouses in Valheim.