Welcome to the Callisto Multiverse
The Callisto Grand philosophy
The Callisto Grand philosophy is dedicated to every aspect of Credit Management and Order to Cash across a wide geography.
Trade Receivables is almost every company’s largest, most complex Current Asset and business-critical component of Working Capital and Cash Flow.
All roles in C2C, I2C, O2C, AR, Accounts Receivable, Risk, Collections, Cash Application, Disputes, Billing, Database and Reporting are the guardians of this asset, responsible for protecting the profit margin and impacting business growth.
Callisto Grand welcomes everyone and has development programmes whether you are an Associate, Specialist, Subject Matter Expert (SME), Team Leader, Credit Controller, Manager, Global Process Owner (GPO) or Director in any type of business, Shared Service Centre (SSC), Global Business Services (GBS) or Business Process Outsourcing (BPO).
Irrespective of job title or experience, your role is essential and Callisto Grand promotes Credit / O2C as a respected, dynamic, challenging, varied, exciting and rewarding profession.
Our team and advisory network comprise highly knowledgeable and dedicated professionals with a wealth of global experience.
The Callisto Grand Academy training, qualifications, analytics, coaching, and consultancy are all designed and developed to meet the changing complexities in today’s business environment, supporting all generations from newcomers to directors.
Our Experiences
Credit Matters O2C Conference
Talent Recognition
Credit and Collections Coffee Club
Leadership Training
Today's Challenge = Tomorrow's Opprtunities
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Talent turnover is more than just a statistic—it is a direct hit to your efficiency,
profitability, and O2C performance.
With an annual attrition rate of 15-20% in the SSC and GBS sector, the impact is
undeniable. Departing employees contribute less, newcomers take time to ramp up, and
those training them see a drop in productivity. The result? Lost time, lost money, lost
momentum.
The solution is not just about hiring—it is about investing in talent. Employees who see a
clear career path, engaging work, and opportunities to gain experience are far less likely to
leave. When organisations nurture and develop their people, they do not just retain
talent—they unlock higher efficiency, stronger teams, and better financial outcomes.
That is where we come in. We do not just improve your O2C and Credit efficiency—we help
you retain, develop, and empower the high-performing professionals who drive your
success. A win-win-win for everyone.
The Reality Check
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A Culture of Excellence does not tolerate inefficiency. If your overdue %, unapplied cash,
credit notes vs. sales, or attrition rates exceed 2.5%, there is a deeper issue at play.
These are not just numbers; they are symptoms of weak policies, outdated processes, and
misaligned strategies. The good news? We have the expertise, technology, and a global
network of specialists to diagnose the root causes and implement rapid, effective
solutions.
At all levels—from frontline teams to senior management—there is a common issue:
“They don’t know what they don’t know.” Left unaddressed, these gaps persist. But with
the right training and strategic guidance, teams can turn working capital into cash flow
success.
Achieving key KPIs and progressing to senior leadership requires more than operational
fixes. It demands a comprehensive approach—one that integrates Culture, Leadership,
Talent Development, Technology, Policies, Procedures, Employer Branding, and Diversity.
Excellence is not an accident. It is a strategy. And we are here to help you execute it.
What Sets Us Apart
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We do not just offer training—we deliver real-world solutions designed by enthusiastic,
experienced, and results-driven Credit Professionals.
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✔ Practical, interactive, and immediately applicable—not generic theories or one-size-fits-
all models.
✔ A global perspective—our solutions aren’t UK-centric or limited to accounting principles;
they’re built for the realities of SSCs, GBS, and BPOs.
✔ Built by industry insiders—we’ve been in your shoes, we know your challenges, and we
know how to solve them.
Our expert team and advisory network bring together the best minds in Credit and O2C,
combining deep industry knowledge with firsthand experience to drive real, measurable
impact.
Your challenges are our expertise. Your success is our mission. Let us transform your O2C
together.
Big Data, Talent and Technology
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Turning Big Data into Cash Flow: The Power of Skilled O2C Professionals
In the world of Shared Service Centres (SSCs), Global Business Services (GBS), and Business
Process Outsourcing (BPO), Big Data is everywhere. Every invoice, every transaction, every
data point holds potential—but not all of it is gold. Much of it is noise, and the challenge
lies in sifting through the sand to uncover the true value.
Success in Credit and O2C is not just about handling data; it is about understanding it,
interpreting it, and using it to drive positive cash flow. This requires more than just
technical skills—it demands business acumen, pattern recognition, and the ability to
translate insights into action. To be truly effective, professionals must grasp how their
organisation and clients operate, what adds value, and what is simply noise.
Developing this expertise typically takes years of firsthand experience—or, with the right
guidance and training, a fraction of that time. At Callisto Grand, we fast-track your
professional growth, equipping you with the skills to navigate complexity, identify key
insights, and make an immediate impact.
The data is there. The opportunity is massive. The question is—are you ready to turn it
into results?
The Callisto Grand Story
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Callisto Grand: Redefining Excellence in Credit and O2C for SSCs & GBS
Since its founding in 2010, Callisto Grand has been at the forefront of transforming Credit
and Order-to-Cash (O2C) operations within Shared Service Centres (SSCs) and Global
Business Services (GBS). While these organisations strived for excellence, they lacked a
recognised benchmark for success or dedicated professional development—until Callisto
Grand set the standard.
The vision of Mark Harrison, a leading expert with over 45 years of experience in credit
management, Callisto Grand was built on deep operational expertise and a relentless drive
for innovation. Between 2005 and 2012, Mark played a pivotal role in shaping the O2C
landscape for two major SSCs in the Czech Republic, all while earning an Honours Degree in
Credit Management. His groundbreaking research, including the dissertation ‘Credit
Management in SSCs,’ exposed a significant gap: O2C was neither widely recognised nor
supported by specialised training.
Seizing this opportunity, Callisto Grand—originally known as CZICM and ACCEE—was
created to equip the rapidly expanding multinational shared services sector with the skills
and knowledge it needed. What began as targeted training sessions in the Czech Republic
quickly gained momentum, expanding across Central Europe and beyond. Initially focused
on Collections, Callisto Grand has since evolved into a global leader in professional
development, capability building, and connectivity for Credit and O2C professionals.
Elevating Industry Standards
Today, Callisto Grand delivers four levels of professional qualifications, accredited CPD
programs, and a suite of dynamic workshops, ensuring professionals stay ahead in an ever-
changing landscape. With a team of seasoned trainers and industry experts, Callisto Grand
is more than just a training provider—it is a hub for innovation, collaboration, and shared
success.
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By fostering a global community of Credit and O2C professionals, Callisto Grand is shaping
the future of the industry—setting new standards, driving best practices, and building the
world’s largest professional network in this space.
The journey continues—join us and be part of the transformation.
From Our Founder & CEO
My professional odyssey began unexpectedly, stepping in as a Credit Controller. That moment ignited my passion for a career that spans over four decades in the ever-evolving landscape of Credit / O2C and across various work environments like Centralized, Decentralized and Global Business Services.
Callisto Grand, the name inspired by my grandfather’s houseboat, is more than an organization; it’s a celebration of the enduring enchantment found in the world of Credit. Few roles offer the unique ability to impact every stakeholder in a business positively. We believe work should transcend the confines of a 9 to 5 process or routine. Callisto Grand is committed to sharing the magic that makes each day more than just a process.
The greatest reward for my team and me is connecting with those who ‘get it’—individuals who share our passion.
We’re excited to meet you at our roundtables, conferences and training programmes sharing how you too can experience the same sense of fulfilment.
Looking forward to connecting,
Mark Harrison
Founder and CEO, Callisto Grand