Alan Charlesworth is a senior lecturer in marketing at a UK university and has been involved in what we now call 'Digital Marketing' in either practical, training, research or academic roles since 1996.

He is the author of seven books:

Key Concepts in e-Commerce
Internet Marketing - a Practical Approach 1st edition
Digital Marketing - a Practical Approach 2nd edition
An introduction to Social Media Marketing
The Digital Revolution
A glossary of Internet Marketing terms, phrases and concepts
Choosing the Right Domain Name: a marketing perspective

and co-author of another,

Online Marketing - a Customer-Led Approach.

His own web site can be found on: Alan Charlesworth . eu, including a full profile.