CLICK BELOW TO WATCH FIRST!
Who We Are
Onslaught (noun) — a fierce, overwhelming force applied with precision.
That’s exactly how we approach lead generation.
At Onslaught, our sole objective is market victory for our clients.
If you’re not winning, neither are we.
We don’t spread ourselves thin across industries.
We specialize exclusively in concrete coating companies, deploying proven marketing systems designed to capture local demand and convert homeowners into booked jobs, month after month.
Our Team
Collin Leishman
Founder
Software & operations–driven systems builder
Specializes exclusively in concrete coating companies
Focused on predictable demand and booked jobs
Background
Onslaught was built on experience, not theory.
I come from a family that stands on business. We have built successful marketing agencies from the ground up. My own background is in software engineering and operations, focused on building systems that scale, perform, and hold up under pressure.
That foundation shapes everything Annabelle and I do at Onslaught.
Experience & Approach
I started Onslaught because I saw concrete coating companies trapped in the feast or famine cycle. One month slammed with work, the next month scrambling for leads. Relying on word of mouth and hoping the phone rings. That's no way to run a business.
We built a proven system that generates qualified homeowner leads every month for concrete coating companies. We only work with one company per territory. When we enter your market, we're fighting alongside you, not against you.
Annabelle Leishman
Co-Founder
Information systems and IT driven systems builder
Data first approach to marketing performance
Oversees client delivery, analytics, and optimization
Background
I’ve always been drawn to solving complex problems through data and technology. I hold a Bachelor’s degree in Information Systems and a Master’s in IT and Project Management, with a focus on building scalable systems and tracking the metrics that actually matter.
That technical foundation shapes how I approach everything at Onslaught.
Experience & Approach
At Onslaught, I design and manage our client delivery systems. From website builds (like this one!) to campaign analytics. Every lead we get is tracked, measured, and continuously optimized.
Marketing without data is just guessing, and our clients deserve the very best. My role is to ensure every system we deploy is measurable, repeatable, and built to scale.
Annabelle Leishman
Co-Founder
Information systems and IT driven systems builder
Data first approach to marketing performance
Oversees client delivery, analytics, and optimization
COMPANY
CUSTOMER CARE
CUSTOMER CARE
NEWS
LEGAL
© Copyright 2026. Salt Lake City. All Rights Reserved.