Mitchell Keller
Mitchell Keller is the founder of Legion. On the Legion blog, he writes about go-to-market systems, outbound marketing, and the use of AI agents in marketing work. His posts cover cold email deliverability, LinkedIn InMail, finding companies and contacts for outbound, and identifying opportunities among competitors’ customers. He also writes about building an outbound AI SDR, using Claude Code for GTM tasks, and managing a GTM team with a Grok bot. Other articles explore using Claude Code for a YouTube workflow and turning an expert’s public material into an AI consultant. These articles bring together practical guides, templates, and accounts of the systems he is building. His public profiles include X, YouTube, and GitHub. Readers can follow those profiles for more of his work or browse his published articles below.
Articles by Mitchell Keller
- Growth engineer: what the role is, what you build, and how to become one
- Growth roles explained: head of growth, growth strategist, growth marketing manager, growth engineer
- How to scale a business without hiring a team: systems, agents and the order to build them
- Clay alternatives for GTM builders, ranked by what an agent can drive
- How I Use Grok Bot to Run GTM and Content
- How to Segment a Market for Outbound Sales (and Split Test Every Segment)
- How to Refer Data-License Deals, and What Changes If You Become the Broker
- Adding Keenable to Google and TinyFish took our funding round capture from 71.4% to 89.6%
- How to Turn Any Expert Into Your Own AI Consultant
- Stop Building AI Assistants. Build an AI Management Team With Grok Bot.
- The Complete Guide To Finding Every Company and Contact in a Market
- The Ultimate Guide to High-Volume Cold Email Deliverability in 2026
- The Complete LinkedIn InMail Operating System
- I Started Letting Claude Code Run My YouTube. This Is What Happened.
- Building an outbound AI SDR that isn't a black box
- How to Steal Your Competitors' Customers (3 ways)
- 3 Claude Code GTM skills you can stand up in an hour that will make you superhuman
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