Authors Ian Sanders and David Sloly show readers how to "mash-up" their full skill set to create the work life they want. Along the way, they introduce an army of "mashers" who are already making the most of their multiple interests and skills. Interviewees include Worldwide CEO of Saatchi and Saatchi Kevin Roberts, entrepreneur, film-maker and Grammy-award winning musician Dave Stewart and a long list of mashers whose plural careers include running a spice trading company, writing a biography of Florence and the Machine, founding a famous series of "ideas" lectures, zookeeping, setting up a DJ agency, and blogging for the London 2012 Olympics.

To help readers unleash themselves from the black and white single job-title mindset, the authors offer advice on:

- How to use the "mash" concept to gain a competitive edge in the job market and be more of an asset to employers
- How to get satisfaction and stimulation by crafting the work-life that reflects them
- How to communicate talents clearly so people understand what they do and want to work with or hire them
- How to go plural when you already feel short on time by making the most out of hobbies
- How a masher is more productive when portable rather than chained to a desk

Mash-Up explains that the future of the workplace will be just like Generation Flux, embracing instability, a business model that is agile, a career with no "Five Year Plan" and ultimately, a world where roles, departments, careers and businesses are all "mashed."