We are expert sales professionals with great credentials in training, coaching and recruiting – passionate about selling, and passionate about people.

Our approach focuses on performance and positive change. We deliver services that not only stimulate business growth; they help people reach their full potential. A veteran sales professional with a background in businesses of all shapes and sizes, Mark Erskine is the founder-owner of Seller Performance.

Together, our associates bring decades of sales leadership experience and an arsenal of engaging tools and techniques to the training and development table.



Meet the Team



With a long and impressive track record in the field of sales management, Mark delivers change in complex and challenging markets.

A highly experienced sales performance specialist, Mark helps clients identify new strategies and then builds the sales team’s capability to put them in motion.

He has over 30 years’ experience in business-to-business sales and can readily claim to have walked the walk.

This first-hand know-how enables him to maximise the potential of people working in business growth teams. In particular, he’s adept at honing sales leadership skills and the quality of sales and account management teams.

Mark mixes sales process mapping with training, coaching and mentoring to deliver improved performance. His focus is on raising the ratio of individual closed sales, increasing the average value of each sale and generating a positive ROI.

A Miller Heiman accredited Independent Sales Consultant (ICS), he is licensed to deliver the world’s largest sales performance training firm’s methodology, which he’s used personally since 1995.

Mark became a trained Miller Heiman facilitator in 2007 and a fully licensed ISC in 2011 – no mean feat. He is regularly reassessed to the company’s exacting standards.

In addition, he employs respected psychometric profiling tools from Saville Wave and Thomas International to assess individual training needs and recruitment strategies. He is also an accredited provider of the world-renowned LIFO® system of behavioural testing and development, which focuses on how sales people naturally behave, and how to use their innate strengths to build better relationships and boost revenue growth.

Mark’s sales career began with the world’s leading food service management company Compass Group, where he moved up the ranks to become corporate sales director UK. He was then appointed to a number of senior roles in the facilities management market.

As national accounts director for Connaught Group, in 2006 he was tasked to drive growth in the health and safety compliance sector during a period of rapid acquisition. He was later appointed sales training and development director for the Group, where he implemented field-based training, coaching and assessment, created a common sales process for the business and introduced training programmes and methodologies.

Mark set up Seller Performance in 2011. Since then, he’s worked with blue chip companies in a variety of sectors including facilities management, manufacturing, logistics, transport, technology, finance, insurance, pharmaceuticals and oil and gas.

The driving goal throughout his career – and it remains today – is the recruitment and development of highly-motivated sales professionals who follow robust sales processes.

Mark is professionally accredited with the Institute of Leadership and Management (Level 5 coach) and is a Fellow of the Institute of Sales and Marketing Management.


Gary is a first class motivational business coach and a master at building rapport. He brings exceptional commercial insight to the training arena.

Just as elite athletes work with an expert coach, people and teams can reach their full potential with the benefit of personal coaching, Gary believes.

It’s a philosophy he’s formed over 15 years in commercial management, most recently in digital media, where the dynamics of a fast-moving, competitive market demanded new ways of working.

For Gary, coaching is all about supporting people to pursue bigger goals with greater confidence – a leadership style he’s put into practice in previous roles.

As head of online sales for telegraph.co.uk, he played a key part in transforming the daily’s sales culture from a newspaper team to the UK’s first multi‐media operation.

He later joined itv.com as online sales director, where he launched the channel’s rival to BBC iPlayer and remodelled the trading culture to include video advertising.

More recently, he was commercial director behind the launch of O2 Media, the UK’s leader in mobile advertising – a growth market undergoing constant change.

Professionally accredited with The International Coaching Federation, Gary’s focus is on supporting high performing teams and individuals.

Today he delivers skills-based workshops and personal coaching to businesses of all shapes and sizes – from start-ups to major public and private sector clients.





individual performance
individual team impact
closed sale ratios
average value per sale
 forecast accuracy
 cost of sale


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