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Coleago Directors

Stefan Zehle, Chairman and CEO at Coleago Consulting

Stefan Zehle

Chairman and CEO

Stefan is the CEO and the co-founder of Coleago Consulting. He has been working in telecoms since 1987 with experience in over 65 countries. Stefan is a director of a start-up mobile operator, and an expert in spectrum valuation and licensing.

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Graham Friend, Managing Director at Coleago Consulting

Graham Friend

Managing Director

Graham Friend is the co-founder and Managing Director of Coleago, where he focuses on strategic business planning, valuation, auction bidding strategy and regulatory issues.

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Scott McKenzie, Director at Coleago Consulting

Scott McKenzie

Director

Scott is one of the directors of Coleago and is a highly experienced consultant with over 30 years’ experience in the telecoms and high technology industries. Since joining Coleago, he has led numerous complex spectrum, fibre, MVNO, regulatory, transaction and training projects.

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Managing Consultants

Rodrigo Barreto, Managing Consultant at Coleago Consulting

Rodrigo Barreto

Managing Consultant

Rodrigo has 30+ years of experience in Telecommunications, specialising in technology, strategy, and regulation. He consults for diverse international clients and excels in Techno Economic Analysis modelling.

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Julian Garrett, Managing Consultant at Coleago Consulting

Julian Garrett

Managing Consultant

Julian is a highly experienced telecommunications professional with over 25 years of leadership in mobile network innovation and transformation, with a track record spanning 19 countries.

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Dave Tanner, Managing Consultant at Coleago Consulting

Dave Tanner

Managing Consultant

Dave Tanner is an highly experienced senior engineering professional with 30 years of specialist technical and operational expertise in telecoms, specifically, wireless (2G-5G/ WiFi/ IoT), fibre and satellite.

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Simon Woodland, Managing Consultant at Coleago Consulting

Simon Woodland

Managing Consultant

Simon Woodland is a member of Coleago’s financial modelling and training team, and is a seasoned management consultant with expertise in mergers and acquisitions, valuations, licence bids, financial forecasting and business planning.

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Marios Nicolaou, Managing Consultant at Coleago Consulting

Marios Nicolaou

Managing Consultant

Marios Nicolaou leads the technical aspects of consulting engagements. These include the formulation of technology and spectrum strategies including advanced modelling and analysis of wireless networks. He finds the optimal trade-off between investments in spectrum and or associated upgrades in technologies to satisfy the 2G, 3G, 4G and 5G demand from users and devices.

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Karl Wermig, Managing Consultant at Coleago Consulting

Karl Wermig

Managing Consultant

Karl Wermig specialises in national broadband planning and related infrastructure deployments, operations and commercialisation and has delivered more than 100 telecoms consulting engagements.

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Ken Pearson, Managing Consultant at Coleago Consulting

Ken Pearson

Managing Consultant

Ken Pearson is a seasoned advisor with over three decades of experience of guiding telecommunications regulators and mobile network operators worldwide.

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Mark Rutherford, Managing Consultant at Coleago Consulting

Mark Rutherford

Managing Consultant

Mark Rutherford has over 25 years’ experience in fixed and mobile communications and technology development. He is a specialist in valuation, commercial strategy and business planning.

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Mike Johnston, Managing Consultant at Coleago Consulting

Mike Johnston

Managing Consultant

Mike has over 25 years’ experience in telecoms and specialises in fibre network infrastructure and project delivery. He works on strategic development projects for government intervention to accelerate fibre delivery, technical M&A due diligence for private sector and financial institutions and business strategy and planning for telecom operators.

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Sebastiaan van den Deijssel, Managing Consultant at Coleago Consulting

Sebastiaan van den Deijssel

Managing Consultant

Sebastiaan has over 15 years of professional experience in marketing, product development, sales, customer care, BSS/OSS, and business modelling for Telecom. He is one of the foremost experts in the field of MVNEs and MVNOs. He gained his experience in key roles within MNOs, MVNOs as well as MVNEs in Europe, Middle East, Africa, Caribbean and the USA.

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Ade Ajibulu, Managing Consultant at Coleago Consulting

Ade Ajibulu

Managing Consultant

Ade Ajibulu has over 30 years’ experience in communications. In addition to business modelling and strategy, Ade is also an expert on regulation, previously for Ofcom and now as a consultant.

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Omar Alshaer, Managing Consultant at Coleago Consulting

Omar Alshaer

Managing Consultant

With more than 25 years of international experience, Omar has a strong background in telecommunications, specialising in cellular (3G, 4G and 5G) and public safety (TETRA and UHF) technologies.

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Nick Fookes, Managing Consultant at Coleago Consulting

Nick Fookes

Managing Consultant

Nick is a telecoms, media and tech veteran with 30 years of experience in M&A, strategy, spectrum auctions, and public policy development and advocacy, across developed as well as emerging markets.

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David Barker, Managing Consultant at Coleago Consulting

David Barker

Managing Consultant

David is a cellular network and technical radio spectrum domain expert in Coleago’s spectrum strategy and spectrum valuation practice areas. He is a specialist in the analysis of spectrum holdings, inference risks and development of technical valuation models.

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Tim Bosworth, Managing Consultant at Coleago Consulting

Tim Bosworth

Managing Consultant

Tim Bosworth is Coleago’s leadership development and team effectiveness expert. He focuses on supporting for Coleago clients through individual and team coaching, leadership development training and running team and individual psychometric profiling and assessment.

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David Conn, Managing Consultant at Coleago Consulting

David Conn

Managing Consultant

David is a senior finance professional with over two decades of experience in the telecoms sector. He is a specialist in business planning, forecasting, financial modelling and valuation in support of spectrum valuation and strategy projects.

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Domingo Villanueva, Managing Consultant at Coleago Consulting

Domingo Villanueva

Managing Consultant

Domingo Villanueva is an expert in regulatory cost accounting and definition and valuation of remedies in the context of mergers and acquisitions in the Telecoms sector. He holds an MBA from IE Business School and a BA in Business Administration from ICADE Madrid.

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Alison Hancock, Managing Consultant at Coleago Consulting

Alison Hancock

Managing Consultant

With 30 years in telecoms, Alison Hancock is a senior telecoms professional experienced in strategy, commercial support, business planning and spectrum consultations and auctions.

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Matt Halfmann, Managing Consultant at Coleago Consulting

Matt Halfmann

Managing Consultant

Matt Halfmann is an accomplished telecoms strategist, business modeler and executive trainer, has unrivalled expertise in digital infrastructure and telecoms regulation, and has worked in more than 100 countries.

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