Gojko Adzic is a strategic software delivery consultant who works with ambitious teams to align software delivery with business goals and improve the quality of their software products and processes. Gojko specializes in are agile and lean quality improvement, in particular, impact mapping, agile testing, specification by example and behavior driven development. Gojko is a frequent keynote speaker at leading software development conferences and one of the authors of MindMup and Claudia.js
Books by Gojko Adzic: Amazon page: http://amzn.to/2i3l0DH
Impact Mapping: Making a Big Impact with Software Products and Projects
Fifty Quick Ideas To Improve Your Tests
Fifty Quick Ideas to Improve Your User Stories
There are others!
You can find Gojko at https://gojko.net and on Twitter @gojkoadzic