Winterhawk is not your typical consultancy service.

We have been ‘the customer,’ responsible for delivering enterprise-wide solutions and services; we have managed budgets and presented to executive committees, and that’s what sets us apart. Because our senior leadership can relate to your challenges, Winterhawk offers more than a conventional consulting service. We will work with you and support you through every stage of your project.

Our growing Advisory Board consists of telecom and financial services CEOs, seasoned sales and financial executives, who provide key insights and strategic advice.

Meet the Partners

Steve Hewison

CEO, Managing Director  

As the CEO and owner of Winterhawk, Steve is responsible for all day-to-day operations, resource and management decisions and for developing company strategy. Steve began his career in technology some 27 years ago and has more than 20 years’ senior leadership experience in large blue chip organisations. He has managed SAP Centres of Excellence, Quality Assurance, IT and SAP Security and Governance groups across Financial Services, Consumer Packaged Goods and Media industries. Steve has worked in numerous countries across Europe as well as in North America, and managed multiple large, global SAP Security projects. In addition, he has extensive experience with developing controls, implementing policies and procedures to meet new and evolving regulatory requirements and streamlining business procedures to enhance productivity, and to achieve cost and resource efficiencies.

Andrew Sawyer

Head of Global Operations  

Andrew is a technology leader with twenty years of experience implementing systems and technology transformation programmes. He has a wealth of knowledge and hands-on experience across Data Management, GRC, Security, Business and Process Controls, and has worked in a diverse range of industries including  Consumer Packaged Goods,  Automotive, Energy, Financial Services, Aviation, Retail and Telecommunications. At Winterhawk, Andrew is responsible for all aspects of operational delivery and quality assurance, across all clients and geographies.

Linda Hewison

Head of Global Delivery  

Linda has worked in SAP Security, GRC and Internal Controls for more than ten years. Working mainly in the Consumer Packaged Goods, Beverage and Retail sectors, her roles and responsibilities have included SAP GRC Implementations, Security Design and Redesign, projects and global support as well as rolling out training and education programmes. Developing efficient managed services offerings is essential to Winterhawk building loyal clientele and valued services, Linda is responsible for the overall delivery of BAU support and managed services to our clients. Linda has worked in the United States and various European locations, and is fluent in English and Swedish.

Meet the Leads

Toni Cherry

Head of Media & Marketing  

Toni joins Winterhawk with a diverse background across many sectors, including publishing, corporate compliance and media, with companies in the UK and Canada. After completing her degree in Psychology & Communications, Toni travelled extensively before making Northern Ireland her home. She spent six varied years as part of the Marketing, Communications & Audiences team at BBC Northern Ireland on projects including evaluating programme performance, event planning and cross-departmental promotional strategies.

Simon Riley

Programme Management Director  

Simon is a dynamic and proactive professional with over 20 years of experience delivering both business and IT change. He has a proven ability to develop and motivate successful teams and has managed enterprise level SAP and Oracle implementations as well as large scale cloud and transformation programmes. Simon has a wealth of experience across retail, telecom, energy, financial Services, and life sciences industries and is Prince 2 trained.

Winterhawk Bill Oliver

Bill Oliver

Head of Technology  

Bill has more than twenty years of experience in information security and auditing, and has held managerial roles in external audit, advisory, and assurance services. Specialising in global SAP Security projects and GRC Implementation projects, he is a regular speaker at SAP Conferences in the United States and in Europe. Bill holds a master’s degree in Information Technology from Boston University and is a Certified Information Systems Auditor (CISA).


Stephane Vitalis Brun

Lead Identity & Process Architect  

Stephane is a GRC Process and Identity specialist. Across his 28 years in IT, Stephane has worked in Service Delivery, Security, GRC, Supply Chain, Order to Cash, BI, Demand Planning, HR and Finance groups, predominantly supporting large enterprise organisations. He provides a calm and considered approach with a strong desire to enhance processes and improve user experiences. Stephane has worked in various European locations, and is fluent in English and French.


Advisory Board

Jan Ziskasen, Winterhawk

Jan Ziskasen

Chairman of Advisory Board

Based between the UK and United States, Jan is a visionary technology executive with over twenty years of experience with large scale systems and technology transformations and operations, managing annual budgets in excess of $150 million. After 8 years in the United States where he was serving as Chief Technology Officer at Kraft Foods Group, Jan has returned to Europe where he assumed the role of Chief Executive Officer at Faroese Telecom. Jan earned his Bachelor’s and Master’s Degrees in Business Administration and Computer Science from the Copenhagen Business School in Denmark.

Lars Andersson

Advisory Board Member

Based in Sweden, Lars is a Venture Capitalist with more than 30 years of experience running businesses in Scandinavia. He studied economics at University, becoming a controller at an international production company, which included responsibility for procurement and HR. He has been a Chief of Finance in both private and public forestry export companies, handling information to the stock market and has served on multiple boards.

Jonathan Mayle

Advisory Board Member

Jon’s career has spanned 4 decades which has included working for major global organisations across electronics, manufacturing and financial services sectors. He’s been the head of SAP Basis, including SAP Security, and has provided insight to senior executives in dealing with situations such as WannaCry ransomware attacks. Jon is currently specialising in global financial market data analysis.

Mike Butcher

Advisory Board Member

Mike has been in the IT industry for 15 years, and is currently an EMEA Professional Services Practice Director at Oracle NetSuite. He started his career as a Graduate Analyst at Accenture, then spent a number of years in the SAP space working on EMEA rollouts at Kraft Foods Group. After joining HCL Axon, supporting the Transport for London account, Mike worked on SAP HCM project deployments in Australia before returning to the UK to continue in SAP Project Management . He has a Law and Economics Degree from the University of Leicester.