Founded 2011
Fifteen Years of Transforming Workplaces
Clarendon Advisory was founded in 2011 by Dr. Sarah Calloway, a former organisational psychologist with a vision to bring genuinely evidence-based communication and leadership consulting to UK businesses. Starting with a small team of three in a single office in the City of London, the firm has grown steadily on the back of client referrals and measurable results.
We work with organisations across every sector — from financial services and professional services to healthcare, manufacturing, and the public sector. Our clients range from ambitious scale-ups to long-established FTSE 250 companies, united by a common ambition: to communicate better, lead more effectively, and create workplaces where people genuinely thrive.
Our mission has always been simple: to help organisations unlock the full potential of their people through clearer communication, stronger leadership, and healthier workplace cultures. We believe that when communication breaks down, organisations stagnate — and when it flows freely, they flourish.
Today, we are a team of twelve specialist consultants, coaches and facilitators, all practitioner-led and drawing on decades of combined experience in the field. We remain proudly independent, partner-led, and deeply committed to the work we do.
