The People Behind Revantoro
Our consulting team combines deep functional expertise with broad industry experience, and every member has held operating or advisory roles that go beyond traditional consulting. We keep our team deliberately senior — you will always work with people who have seen the challenges you are facing from multiple angles and at multiple scales. Below are the core members who lead our client engagements.
Marcus Ellerton
Managing Partner
Marcus has spent over twenty years advising executive teams on corporate strategy, restructuring, and performance improvement across Europe and North America. Before founding Revantoro, he held a senior partner role at a global strategy firm and served as interim CFO for two mid-market industrials businesses during turnaround periods. He leads our most complex restructuring and revenue transformation engagements personally.
Diane Kowalczyk
Partner, Revenue Optimisation
Diane specialises in commercial strategy, pricing architecture, and sales organisation design, with a particular focus on B2B companies operating in competitive markets. She spent twelve years in corporate development and commercial leadership roles before joining Revantoro, and holds an MBA from a leading European business school. Her work typically produces measurable revenue uplift within the first six months of an engagement.
Stefan Brauer
Partner, Operational Excellence
Stefan leads our operational efficiency and cost transformation practice, drawing on fifteen years of experience in lean operations, procurement redesign, and shared services implementation. He has worked across manufacturing, logistics, and healthcare services, and is known for his ability to build credibility quickly with operations teams who are sceptical of external consultants. His programmes are known for delivering results that outlast the engagement itself.
Amara Osei-Bonsu
Principal, Organisational Transformation
Amara focuses on the human and structural dimensions of business change — organisational design, change management, and leadership alignment — which are often the decisive factors in whether a strategy succeeds or stalls. She holds a doctorate in organisational behaviour and has led transformation programmes at companies with headcounts ranging from two hundred to over eight thousand. Clients consistently cite her ability to build trust across all levels of an organisation as a key driver of project outcomes.
Lena Thorvaldsen
Senior Consultant, Financial Analysis
Lena provides the financial modelling and performance analytics underpinning Revantoro's diagnostic and strategy work, bringing a level of rigour that allows clients to make decisions with genuine confidence. She qualified as a chartered accountant before moving into consulting and has built financial models supporting over thirty business transformation cases. Her work on cost structure benchmarking and profitability analysis has directly shaped the strategic direction of numerous engagements.