We hustle with heart, combining determination with understanding.
About us
We want to be more than just consultants; we’re partners you can rely on when it matters most. We stay focused on your ambitions, your results and your people. We deliver through humility and true collaboration.
Our Street Style
Driven with empathy
Clarity over complexity
We cut through the noise to simplify what matters most.
Impact, fast
We focus on actions that make a difference. We expedite impact.
Pragmatic
We flex our approach to our clients’ specific needs and environment, remaining pragmatic throughout.
Expertise we bring to our clients
Our clients rely on us as true partners in delivering transformation programmes, driving change, and building effective leadership performance strategies.
Meet our leadership team
A high-performing, down-to-earth, and energetic team - here are some of our profiles.
Jon Breger
Managing Partner
About
Jon combines his expertise from previous roles in industry working for leading FTSE companies sandwiched between a career in high-impact consulting. He’s known for cutting through complexity, keeping his cool and delivering results when the stakes are high.
Jon held senior positions in two FTSE 100 companies to compliment his many years as a management consultant; this has equipped him with a rare inside-out perspective on how businesses truly operate. He has spearheaded high-stakes transformation programmes, complex M&A integrations and separations, building a reputation for bringing clarity and calm to complex high-pressure environments.
Jon operates at C-suite level and is known for his decisive, no-nonsense leadership style. He leads with accountability and authenticity, ensuring he takes people on the journey with him.
Outside of work, Jon’s focus turns to family. Along with his wonderful wife, he can be found supporting his two kids, cheering them on from the sidelines of their football matches, taxiing them around and being kept busy as head chef of the household.
Jon’s hidden talent:
He can play music on his teeth; a great icebreaker but it’s yet to win him any awards!
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Cathy Porritt
Managing Partner
About
Cathy began her career as a trainee at AXA before moving into consulting, where she has spent her career immersed in insurance and financial services.
She is energised by the industry’s complexity — from navigating regulation and organisational change to shaping distinctive products in markets often defined by necessity rather than choice.
She thrives on the pace and collaboration required to deliver real change, working closely with client teams to solve complex problems together. With broad expertise spanning portfolio and programme management, change delivery and product management, Cathy partners with general and specialty insurers as well as retail and commercial banks.
Outside of work, Cathy has a young daughter, a border collie named Oat, and a lively flock of 30 sheep – all of which keep her on her toes.
Top of her bucket list:
Running the Coast to Coast with friends and my dog
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Harry Mulheran
Managing Partner
About
Harry honed his consulting skills at a Big Four firm, before progressing into senior leadership at a challenger consultancy and then co-founding Seven Street. Harry is known for his calm, assured approach and his ability to turn complex ambitions into tangible results.
Harry’s experience covers transformation, change management and target operating model design, with a strong focus on the life sciences sector. He has also worked extensively across financial services and FMCG, bringing a rounded perspective on how organisations deliver lasting change.
He works closely with senior clients to navigate the challenges of large-scale transformation, combining energy, clarity and genuine partnership. With his own teams, he leads through empowerment — surrounding himself with talented people and creating the conditions for them to thrive.
Away from work, Harry enjoys time with his partner, two children and their dog, Paddy, often outdoors or working on a DIY project.
Top of his bucket list:
Taking part in the Mongol Rally – an adventurous driving challenge spanning over 10,000 miles across Europe and Asia
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Ashley Shakibai
Managing Partner
About
Ash has over a decade of transformation and programme management experience, leading multi-million pound initiatives across a number of industries, including financial services, retail, consumer goods, private equity and property. His key expertise has been in mergers & acquisitions, finance transformation leadership and innovation.
He previously worked in KPMG’s management consulting and transaction services (private equity) teams and was a client director at a challenger consultancy.
He is motivated by getting stuck in to resolve complex cross-functional client challenges.
Ash is a chartered management accountant and has a strong entrepreneurial background, co-founding an award-winning snack business. Ash began his career working in Wayne Rooney’s management team.
Ash has two young children that keep him busy outside of work.
His childhood hero:
I was very lucky to have lots of people who inspired me growing up, but my childhood hero was my dad. He was massively competitive and had an incredible work ethic. He still inspires me to this day.
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Katerina Pettitt
Head of Change
About
Katerina is a strategic and people-focused change leader with deep experience delivering complex transformation across global organisations. Katerina is driven by a belief that lasting change happens when people feel heard, supported, and empowered.
She began her career in PR and marketing, where she developed a strong appreciation for the power of communication; an insight that continues to shape her approach to stakeholder engagement and change leadership.
Combining her experience with her knowledge of change methodologies and behaviour science, she tailors change approaches to each unique challenge, always aiming to create impact that lasts.
Known for her ability to build trusted relationships with senior leaders and challenge conventional thinking, Katerina thrives on driving forward change that delivers results and a positive employee experience.
Outside of work Katerina can either be found chasing after her young son, in the Pilates studio or cooking a new dish.
A song that always lifts her is…
Don’t Stop Believing – Journey; she has very fond memories of listening to the song on the cassette player in her Dad’s car!
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Harriet Burrows
Head of Leadership Performance
About
Harriet is an award-winning executive coach and management consultant specialising in leadership performance and change delivery. She believes that in today’s fast-moving world, organisations only realise the value of change when leaders evolve how they think, lead and operate to ensure they are equipped to take their people with them.
Her work spans leadership performance programmes, hands-on delivery of high-priority change initiatives, and one-to-one executive coaching to accelerate individual impact and performance.
Harriet brings experiences from consulting as well as in-house leadership roles. This included a Head of Leadership and Culture role where she partnered with COOs and CEOs across financial services, public sector and major infrastructure environments to deliver complex change and build lasting internal capability.
Known for her warm, grounded and ‘can-do’ approach, she is trusted by leaders and teams to help them navigate uncertainty, turn ambition into action, and grow as leaders while delivering results.
Outside of work, Harriet can usually be found jumping into her camper-van and planning her next travel adventure.
What’s on Harriet’s bucket list?
Harriet has trained to become a Competent Crew on a sailing boat. Her next challenge is to step up as a skipper and take her friends and family on a sailing trip around Greece, living the ultimate Mamma Mia adventure.
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James Brewin
Head of Data and AI implementation
About
At Seven Street, his role is twofold. He works with senior leaders to help their organisation realise lasting value from data and AI: building the right foundations, designing governance that actually works, and leading the complex programmes that turn strategy into results. Internally, he is driving Seven Street’s ambition to become a genuinely AI-native firm, designing around AI commercially, culturally and operationally rather than simply layering it onto existing ways of working.
James brings over a decade of experience spanning data and AI strategy, operating model design, programme management and post-merger integration. He is a certified Data Management Professional (DAMA) and holds CIMA CBA, PRINCE2 and SAFe qualifications, and is a graduate of the Google Digital Academy.
Beyond consulting, James has founded and run two profitable businesses in the men’s cosmetics and apparel space, and serves as a Trustee of the Sternians Trust Fund, an educational charity managing a significant endowment to support children’s schooling.
Did you know:
James’ three-year-old maltipoo, Edwin, serves as Seven Street’s Chief Morale Officer.
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Careers
We’re always looking for exceptional people to join our team. Whether you’re just starting out or bring many years of experience, we’d love to hear from you.
