Mazelle Siton
Executive & Team Coach
Real-world experience. Human-centred coaching.
I have spent over 15 years in senior leadership at Meta, The Telegraph and OMD UK, leading global research teams of 60+ people and scaling functions from early-stage to maturity, while shaping strategy at board level. What mattered most was building high-performing, close-knit teams, developing leaders, and evolving teams and organisations through growth and change. Coaching and mentoring were always central to my leadership, which helped strengthen leadership pipelines and culture across the organisations I served.
Coaching for growth,
courage and impact
I believe people and teams are inherently creative, resourceful and whole. With the right conditions, they move toward growth. Growth asks for courage, doing something new without guarantees. Coaching is the partnership that makes that possible: a safe, energising space for reflection and experimentation, where leaders and teams strengthen the clarity and confidence they need to make clear-sighted choices, and navigate complexity with resilience.
“She is an empathetic, passionate and compassionate leader and human who fills a room with positive energy.”
Margaret, VP Product Design
“I liked the right balance of how to tease out the answers when I got stuck.”
Rooted in reflection, energised by exploration
I find clarity in nature, walking on Hampstead Heath or barefoot along Camber Sands. Those quiet moments spark the reflection and creativity that fuel my coaching. I’m energised by discovering something new, whether it’s a local restaurant or travelling with my family — most of all when I’m near the water, especially the sea.
Always evolving
Understanding people has always been central to my professional journey. My ongoing psychotherapy training and practice deepen the qualities I bring to coaching — psychological safety, strong partnerships, and an open, flexible stance. These foundations help leaders and teams to do their best work, explore new perspectives, and create lasting, meaningful impact. This is the ethos at the heart of Evolve Coaching Lab.
