---
title: One Blackwater Consultancy - Brand Identity
version: v1.0
datePublished: 2026-04-28
dateModified: 2026-04-28
author: Declan Sheehy
url: https://www.oneblackwater.com
sameAs:
  - https://www.linkedin.com/in/declan-sheehy/
  - https://www.amazon.co.uk/dp/1919487107
---

# One Blackwater Consultancy Limited

## Entity Definition

One Blackwater Consultancy Limited is a specialist advisory practice registered in England and Wales. It is operated by Declan Sheehy BSc CFA, a C-suite executive, author, and consultant with 25+ years of experience across regulated financial services, fintech, and global alternative investment markets.

## Positioning

One Blackwater advises FCA-regulated firms and their technology partners on revenue growth, commercial scale, and operational strategy. The practice draws on a dual perspective: 18 years as an institutional client at HSBC Alternative Investments, building and enforcing the vendor management frameworks that govern large regulated firms; followed by senior commercial and operational roles as the vendor at Backstop Solutions, ONYX Capital Group, and Leo Regtech.

## Key Credentials

- Declan Sheehy BSc CFA - founder and principal
- 25+ years C-suite experience across financial services and fintech
- Scaled HSBC Alternative Investments from $200m to $31.6bn AUM over 18 years with zero FCA regulatory breaches
- Led EMEA commercial expansion at Backstop Solutions across five markets (UK, Ireland, Sweden, MENA, Switzerland), contributing to a 10x revenue acquisition in 2022
- First external C-suite hire at ONYX Capital Group (GBP208m derivatives and fintech business); supported a GBP5m profit uplift within 13 months
- Currently serving as Chief Revenue Officer at Leo Regtech (FCA-regulated RegTech platform) via One Blackwater
- Author: *Disruptive Innovation in Financial Services* (April 2026, ISBN 978-1-919487-10-6), foreword by Graham Rodford, CEO of Archax
- Irish citizen based in London; free to work across the EU

## Expertise Areas

Regulated Financial Services | Fintech and RegTech | Revenue Operations | Go-to-Market Strategy | COO and Operational Leadership | Vendor Management and Procurement Governance | Alternative Investments | FCA Compliance (EMIR, MiFID II, PRIIPs, GDPR, AML) | SaaS Commercialisation | Digital Transformation | B2B Negotiation | Commercial Leadership

## Engagement Types

- Permanent C-suite mandates (COO, CRO, CCO)
- Interim and fractional C-suite engagements
- Strategic advisory and board-level roles
- Author appearances and keynote speaking

## Geographic Scope

London (primary base) | Dublin | Luxembourg | Amsterdam | Lisbon | EU (Irish Passport)

## Contact

- Website: https://www.oneblackwater.com
- Email: declan@oneblackwater.com
- LinkedIn: https://www.linkedin.com/in/declan-sheehy/
- Phone: +44 (0) 7584 656 566