What is the 90-day Leadership Challenge?

In the dynamic arena of global business, how often do leaders pause to refine the very skills that define their success? The 90-Day Leadership Challenge offers a structured, impactful journey towards transformative leadership. This program is meticulously designed to enhance leadership behaviours and deliver measurable organisational benefits, using a blend of traditional values and innovative practices.

Table of Contents

The 90-Day Leadership Challenge Image

Overview of the 90-Day Leadership Challenge

Having worked with Arend for over a decade in a variety of very different circumstances, I am able to confidently testify to the impact he is likely to have on almost any organisational challenge. Arend is particularly expert in finding ways to combine a full range of benefits and in doing so, he has always left a clearly identifiable and long-lasting impact on the skills, knowledge, attitude and most impressively, the financial state of affairs of the organisations I have asked him to help me to improve.COO Shaw Trust

Tools and Techniques at the Heart of Transformation

- Leadership Practices Inventory (LPI)

Kouzes & Posner Five Practices Image
© Copyright 2023 by James M. Kouzes and Barry Z. Posner. Published by The Leadership Challenge, A Wiley Brand.

- Denison's Organisational Culture Survey

Denison Organisational Culture Survey Diagram
© Copyright Denison Consulting LLC

- Lencioni's Five Behaviours of a Cohesive Team Assessment

Lencioni Five Behaviours of Cohesive Team Image
Copyright © 2014 by Patrick Lencioni and John Wiley and Sons, Inc

Join Arend Welmers and Karen Jones as they delve into the tools used in the 90-Day Leadership Challenge, including the Leadership Practices Inventory, Denison’s Leadership 360, and Denison’s Organisational Culture Diagnostics. 


Learn more about what to expect from our 90-day leadership workshop, how it can benefit your leadership team, significantly improve your organisation’s performance and help you and your organisation achieve remarkable success.


To find out more about the tools and diagnostics we use in our leadership challenge, watch our latest video.

The Significance of Self-Awareness and Continuous Improvement

Driving Positive Change Through Proven Frameworks

Measurable Benefits and Organisational Impact

  • Enhanced Leadership Capabilities: Participants in the program not only refine their leadership skills daily but also emerge with enhanced capabilities to inspire and drive their teams, significantly elevating the standard of leadership within their organisation.
  • Improved Team Dynamics: By concentrating on cohesive team behaviours, the program enhances participants’ abilities to foster collaboration, trust, and communication, creating a more supportive work environment that naturally boosts team performance.
  • Practical Learning Through Real Business Opportunities: The programme offers a hands-on approach, where participants can apply newly acquired skills to actual business scenarios, enhancing their learning experience and delivering immediate benefits for their organisation.
  • Measurable Improvements in Leadership Effectiveness: The immediate application of insights from diagnostics and continuous feedback drastically enhances leadership behaviours.
  • Economic Value Creation: By optimising leadership practices, organisations can expect to see a reduction in productivity drag, with financial gains that significantly exceed the cost of the program.
  • Sustainable Change: The challenge’s structure ensures that leadership improvements are not just temporary but are embedded into the daily operations and culture of the organisation.

I lead the People & Culture function with Calibre Scientific and I hired Arend and Karen to deliver a brand-new leadership development program for our leaders. We had exceptional outcomes. We have a very complex, diverse, and highly nimble global work environment, with leaders, at many varying stages of experience and development, across multiple cultures. I was optimistic that the program outlined, by Arend and Karen, would meet the expectations of our participants. However, Arend and Karen far exceeded my expectations and the expectations of our participants, with the Leadership Challenge program! In addition, Arend and Karen are a delight to work with: They are diligent about their preparations and ensure all information/data is collected upfront; they have a magical way of connecting with everyone; they facilitate challenging discussions/content where learning is immediately put into practice and applied. I would highly recommend Ninety Days Ltd and Denison Consulting to provide leadership development for any of your teams.SVP and Chief People Officer – Calibre Scientific

Unique Features of the 90-Day Leadership Challenge

  • Accelerated Performance Cycles (APC): These cycles promote rapid capability development through intensive, real-time feedback loops and iterative learning.
  • Behavioural Scoreboards: Visual tracking of leadership behaviours fosters transparency and continuous improvement.
  • Peer-to-Peer Coaching: This collaborative approach ensures that participants learn from one another, leveraging collective insights and experiences.
  • Evidence-Based Results: Using validated diagnostic tools ensures that improvements are based on solid data, providing clear benchmarks for progress.
  • Scalability and Global Application: The program’s flexibility allows it to be effectively implemented across different geographic locations and cultural contexts, ensuring its benefits are accessible to various organisations.
The 90 Day Leadership Challenge Process
Copyright © The 90-Day Leadership Challenge Process

Concluding Thoughts

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Client Manager

Background Info

Molly studied at Newcastle University and graduated with First Class degree in Philosophy. Molly supports our clients through all stages of their engagement with Ninety Days to ensure projects are executed as planned and that measurable outcomes are achieved. She has worked with a range of SME, public sector and private sector clients.  


Client Manager

Background Info

Ayesha holds an MSc in Management and Strategy from the London School of Economics and Political Science, a degree in International Business, and a Diploma in Management Accounting. As a Client Manager, she collaborates with both public and private sector clients to execute projects within 90 days, delivering measurable impact.  

Ayesha is particularly experienced in managing Transformation Programmes for our clients.  

Dr. Raj Patel MBE

Practice Lead

Background Info

Dr Raj Patel was the Interim Medical Director of Primary Care for NHS England and NHS Improvement. He was previously Medical Director of NHS England for Lancashire and Greater Manchester as well as Director of Commissioning for Lancashire. He currently sits on the General Medical Council and the Doctors and Dentists Remuneration Body.

A Fellow of the Royal College of General Practitioners, Raj was a GP in Greater Manchester for thirty years and has held senior clinical leadership positions in the NHS, locally, regionally and nationally since 1997 as well as a GP advisor role at the Department of Health.

Raj has worked extensively with broadcast and print media in the past. He is a graduate of Manchester University Medical School and sat on the General Assembly of the university. Raj was awarded an MBE in The Queen’s Birthday honours list 2019 for services to healthcare.

Prof. Hilary Garrett CBE

Practice Lead

Background Info

Hilary, CBE, PhD (Hon), MSc, BSc, RGN, RHV, PGCE is an experienced public sector senior leader, recently retired from Deputy Chief Nursing Officer for England post at NHS England. Hilary continues to hold a post as a Non-Executive Director for the NHS Cheshire and Merseyside Integrated Care Board.

Hilary is a registered Nurse and Health Visitor with over 40 years’ experience of working in clinical, public health and leadership roles in the NHS. She held several Director posts across both commissioning and provider environments in addition to holding a Deputy Chief Executive post for both.

She led many local and national programmes of work focusing on improving quality, safety and the working lives of people in the health and care systems.

Hilary is also an accredited senior Executive Coach and Mentor and is passionate about supporting people to realise and achieve their potential. 

John Atkinson


Background Info

John Atkinson serves as a consultant at Ninety Days, specialising in driving transformative change within organisations.

With a strategic approach aligned with Ninety Days’ mission, John collaborates with boards and executive teams to create actionable processes for immediate implementation, ensuring measurable outcomes.

With 30 years of experience, John brings a wealth of expertise to Ninety Days. He has designed engagement processes for the UN Food Systems Summit and supported the World Health Organisation during the Covid-19 pandemic. Notably, John oversaw the ‘Total Place’ program for the UK Government, demonstrating his ability to lead large-scale initiatives.

His pragmatic, hands-on approach, honed through work with global leaders in various sectors, adds significant value to Ninety Days’ interventions.

Mike Gill


Background Info

Mike brings over thirty years of extensive NHS experience, including executive roles as Deputy Chief Executive and Director of Finance.

He has a proven track record in healthcare governance, having led transformation initiatives and improved governance arrangements at various levels within NHS organisations.

Mike’s expertise includes strategic financial planning, quality governance, and risk management. He has supported boards in delivering their strategic objectives and ensuring effective operational autonomy.

As a regular contributor to national board development programs, Mike provides invaluable insights and guidance to healthcare executives and non-executive directors.

Liz Leinhardt


Background Info

Liz, RGN, PGCert Ed, BSc Hons MSc, is a highly qualified healthcare professional with extensive executive and operational experience in top-performing Foundation Acute Trusts, Primary Care, and Commissioning. Her exceptional track record includes consistently delivering performance standards and driving transformational change.

She collaborates with clinical and managerial teams to facilitate service transformation and sustainable change within organisations.

With 30 years of nursing experience and two decades in senior management, Liz possesses a wealth of knowledge in developing and delivering high-quality services.

Philip Curzon

Managing Partner

Background Info

With over forty years in senior leadership roles in both the public and private sector, Philip uses his experience to ensure that our clients execute the measurable change they have agreed upon.

Philip, along with our team of associates, remain with the client throughout the 90 Day Cycle to ensure that there is no loss of focus and that we adapt to the unexpected.

In his most recent role Philip was CEO of an educational technology company which transitioned from a bricks and mortar publishing house to a global online content provider.

He is also an alumni of Harvard Business School, INSEAD and the Army Staff College. 

Impactful Leadership

We focus on producing measurable improvements in key leadership behaviours that directly impact organisational performance.

By benchmarking leaders against global standards and providing personalised coaching, we empower them to inspire, challenge, and guide their teams effectively.

Through our unique 90-day Accelerated Performance CycleTM, leaders not only develop new habits but also lead projects that deliver tangible economic benefits to the organisation, ensuring a clear return on investment in leadership development.

Organisational Transformation

Our approach transcends mere change management, aiming for profound organisational transformation.

By meticulously assessing your organisation’s culture and leadership perceptions, we identify areas of alignment and discrepancies through our unique “heat map.”

This serves as a strategic guide, enabling targeted interventions and inclusive dialogues with senior leadership teams, fostering a culture of continuous improvement and adaptability that endures beyond our intervention.

High Performance Culture

We instil a high-performance culture within your organisation. By engaging employees in strategic thinking, planning, and execution processes, we empower them to understand their individual contributions to organisational success.

This shift in focus from day-to-day operations to strategic alignment cultivates an environment where excellence becomes the norm, driving productivity, innovation, and competitive advantage.

Arend Welmers

Managing Partner

Background Info

Arend works with our clients to design and deliver a process that drives the rapid, measurable improvements that you require. With over thirty years of experience in performance coaching, Arend has dedicated his career to helping organisations accelerate their performance and achieve tangible results.

A challenging, inspiring and highly regarded coach, facilitator and speaker, Arend has a reputation for designing and implementing interventions that challenge conventional practices and quickly generate value for client organisations.

Recent assignments have seen him designing and leading major leadership development and business change strategies in Lisbon, Paris, Berlin, New York and London.