Where complexity, growth and client expectations collide – clarity wins.

In the world of professional services, every client engagement, project delivery and business decision carries weight. As firms scale, workloads intensify, and responsibilities multiply – strategy gets fuzzy, teams stretch, and momentum stalls.

At Sullivan Collective, we partner with leaders and founders in consulting, advisory, agencies, and other service-based firms to create operational clarity, align priorities, and drive disciplined growth. Our goal: help you grow without the friction.

Who we work with

We support a range of professional services businesses – especially those in high-growth, fast-changing, or high-demand environments. Including:

  • Boutique consultancies and advisory firms.
  • Agencies (marketing, creative, digital, design, etc.).
  • B2B service-providers (consulting, coaching, people services, operational support).
  • Firms scaling people, processes, and services – from mid-size practices to enterprise-sized organisations.
  • Organisations juggling multiple services, clients or delivery models.

Where we support professional services firms

We partner with founders and leaders navigating growth, change and complexity.

Strategic Audit

When it’s time to pause, refocus, and realign strategy with market conditions, team capacity, or regulatory shifts.

Fractional COO

For fast-moving firms needing execution firepower – without a full-time operational hire.

Leadership Mentoring

Supporting senior finance leaders with decision-making, pressure management, and clarity through change.

Executive-led Projects

Confidential, senior-level guidance for CEOs and leadership teams during M&A, restructures or operating model shifts – bringing clarity, alignment and a steady hand through complexity.

If you’re a growing professional services firm – and you want clarity, structure, and execution support to scale with confidence, let’s talk.