
David Barker
BEng, MSc Managing Consultant , United KingdomDavid 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.
David is a Chartered Engineer and a 30-year veteran of the radiocommunications industry. He is an experienced senior professional engineer and has spent his career working with and for telecoms consultancies, cellular operators in all continents, military communications, RAN eco-system hardware vendors, RAN design software vendors, and spectrum regulators. A recognised thought leader and a strong communicator, David is able to articulate the benefits, impacts, risks, opportunities and the technical value of radio spectrum to a wide range of audiences. He has filed and been granted numerous patents and has published many papers. David has been an active speaker at industry events throughout his career with a focus on interference analysis, mitigation, network optimisation, cellular antenna systems and spectrum valuation.
Education
Bradford University, UK
- BEng (Hons) – Electrical & Electronic Engineering
Royal Military College of Science, Cranfield University, UK
- MSc – Military Electronic Systems Engineering
Other team members

Marios Nicolaou
Managing ConsultantMarios 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.

Tim Bosworth
Managing ConsultantTim 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.

Sebastiaan van den Deijssel
Managing ConsultantSebastiaan 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.