Hi, I'm Colleen.
One person, every door.
I've never fit neatly into systems, so I build systems that fit people. Founder at Nerdly, former professional mermaid, and a firm believer that your tech should love your people back.
Colleen McCartney
Making a splash is the easy part. The magic is getting people to come back.
I learned that as a professional mermaid and as co-founder of a mermaid convention, long before I learned it in a CRM. Every chapter since has taught me the same thing: people stay where they feel safe and seen.
Pick your door
Business systems
Nerdly is my company: a human-first team that makes your tech love you back, so you keep the clients you love without babysitting your CRM.
Visit Nerdly
Talks and stages
Keynotes, workshops and podcasts on automations with a heartbeat: why people leave when they feel forgotten, and how to keep them.
Book me to speak
The water and the stage
The Celtic Siren is my mermaid self, and Metro MerFolk is the DC-area pod I co-founded. Everyone belongs in the water.
Meet the Siren
Oils, taught simply
Totally Essential is my oils circle, where I'm the teacher, not the seller. Wellness, taught simply.
Join the circle
People find me through one of my worlds. Here's where each one lives.
My story
Every chapter, one thread
Corporate IT and telecom sales. Oils leader. Professional mermaid. Mermaid convention co-founder. Founder at Nerdly. Different rooms, same lesson: when belonging is missing, I build it.
Where you may have seen me
2026 HighLevel SaaSpreneur Gold, with Nerdly · Guest on The Marketer's Toolkit, Ep. 9: Stop Babysitting Your CRM · Featured as a tail-swimming instructor in The Washington Post
Find me online
THE CELTIC SIREN & METRO MERFOLK
TOTALLY ESSENTIAL
One person, every door. Founder at Nerdly, former professional mermaid, and builder of systems that fit people. · Instagram · LinkedIn · Privacy Policy · Terms of Use