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Get to Know Us
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Hazel Hayden
Founder
Hazel Hayden is a Consultant Nurse and leading specialist in men’s and women’s health, with expertise in hormones, metabolism, and lifestyle medicine. She provides evidence-based care to help people optimise their health, energy, and performance at every stage of life. Trained in Testosterone Replacement Therapy (TRT) for men and hormonal health for women, Hazel takes a holistic approach that considers the full picture — from nutrition, sleep, and weight management to cardiovascular and metabolic health. She holds a Diploma in Nutrition, is trained in Cognitive Behavioural Therapy (CBT) and sleep and insomnia therapy, and is also qualified through the National Medical Weight Loss Programme, supporting sustainable, long-term results. An experienced educator and speaker, Hazel regularly delivers talks on men’s and women’s health, mental wellbeing, and lifestyle medicine, and she trains healthcare professionals in advanced hormonal care. She has also combined her clinical knowledge to develop specialist supplements designed to support energy, focus, and vitality for both men and women.
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Dr Daniella Callandrini
Clinical Lead
Dr Daniella Callandrini is an experienced GP and Clinical Lead with over fifteen years of dedicated experience delivering high-quality, patient-centred healthcare. Known for her thoughtful and compassionate approach, she takes the time to listen, understand each individual's concerns, and work collaboratively to develop tailored treatment plans that support long-term health and wellbeing. Daniella provides comprehensive care across a wide range of health concerns affecting both men and women, from preventative health and lifestyle medicine to the diagnosis and management of acute and long-term conditions. She is passionate about delivering evidence-based care that looks beyond symptoms to understand the whole person, ensuring every patient feels heard, supported, and empowered in their healthcare journey. Her clinical expertise spans women's health, sexual and reproductive health, dermatology, chronic disease management, and preventative medicine. She completed specialist placements in obstetrics and gynaecology as well as dermatology, including dedicated training within a vulval dermatology clinic, giving her a breadth of knowledge beyond that of a traditional GP role. Alongside her clinical practice, Daniella has held a number of leadership and advisory positions within the NHS. She has spent the past decade working as a GP Appraiser and has also served as a Clinical Adviser for NHS England's Performance Team, supporting fellow clinicians in maintaining the highest standards of safe, effective, and up-to-date patient care. These roles reflect her commitment to clinical excellence, governance, professional development, and continual improvement across healthcare services. As Clinical Lead, Daniella is dedicated to ensuring patients receive exceptional standards of care, combining clinical expertise with a warm, approachable manner. Her practice is always guided by the latest evidence, professional standards, and a commitment to delivering personalised healthcare that meets the unique needs of every individual.
Kim Jones
Director
Kim Jones is the Director of The Testosterone Hub, where she leads the organisation's strategic growth, service development, and operational delivery. With a strong commitment to improving men's health outcomes, Kim is dedicated to making evidence-based testosterone and hormone health services more accessible, helping men take a proactive approach to their wellbeing, performance, and long-term health. With extensive experience in healthcare leadership, business operations, and service development, Kim has played a key role in creating a patient-centred environment that combines clinical expertise with exceptional customer experience. She oversees all aspects of the organisation, from governance and compliance to marketing, partnerships, and business growth, ensuring the highest standards are maintained across every touchpoint of the patient journey. Working closely with the clinical team, Kim supports the development of innovative services designed to address the growing need for education, assessment, and support in men's hormonal health. Her focus is on helping men better understand the factors that can influence their energy levels, recovery, performance, body composition, and overall quality of life through access to trusted, evidence-based healthcare. Passionate about raising awareness of men's health issues, Kim is actively involved in developing educational initiatives that encourage earlier conversations around hormonal health, preventative healthcare, and wellbeing. She works alongside gyms, sports clubs, employers, healthcare professionals, and community organisations to improve awareness and help break down the stigma that often prevents men from seeking support. Kim is also committed to broadening access to health screening and preventative health services, believing that informed decision-making and early intervention can play a significant role in supporting better long-term health outcomes. Through partnerships, outreach programmes, and workplace wellbeing initiatives, she continues to champion a more proactive approach to men's health. Known for her collaborative leadership style and passion for innovation, Kim is driven by a vision to establish The Testosterone Hub as a trusted destination for men's health education, assessment, and support. Her leadership continues to shape the organisation's growth while ensuring its focus remains firmly on delivering high-quality, accessible, and patient-focused care.
Tim Hayden
CEO
With a strong background in business management and operations, Tim oversees the strategic and operational functions of the brand, ensuring every part of the business runs smoothly and efficiently.
Esther Hatfield
Advanced Nurse Practitioner
With over 17 years of clinical experience, Esther has been supporting individuals to improve their health, wellbeing, and quality of life since 2009. She holds a Master’s degree in Professional Development in Nursing and Midwifery and is a qualified Non-Medical Prescriber, bringing a wealth of knowledge and expertise to patient care. Esther is committed to delivering evidence-based healthcare that helps patients understand their health, address concerns early, and achieve their long-term wellbeing goals. Esther has a particular interest in men’s health and testosterone optimisation, supporting men who may be experiencing symptoms such as fatigue, low energy, reduced motivation, decreased strength, poor recovery, reduced libido, changes in mood, or difficulty maintaining peak performance. She understands that hormonal health can have a significant impact on physical health, mental wellbeing, work performance, fitness, and overall quality of life. Taking a holistic and patient-centred approach, Esther works closely with each individual to gain a thorough understanding of their symptoms, lifestyle, health goals, and clinical needs. Through comprehensive assessment, diagnostic testing, and personalised treatment plans, she helps men make informed decisions about their health and optimise their wellbeing with confidence. Esther is passionate about creating a supportive environment where patients feel comfortable discussing their concerns openly and without judgement. By combining clinical expertise with clear communication and personalised care, she empowers men to take control of their health, understand their numbers, and perform at their best both physically and mentally. Her philosophy is simple: to provide expert, compassionate, and individualised care that helps every patient feel heard, informed, and supported on their journey towards better health.
Francesca Janela
Healthcare Practitioner
Francesca has a background spanning multiple healthcare roles over the past six years, with experience across both NHS and private healthcare settings. Throughout her career, her passion has always centred around people and building genuine connections. She prides herself on helping patients feel at ease and ensuring they feel listened to, valued and cared for. Naturally warm, compassionate and approachable, Francesca believes that the way someone is made to feel can be just as important as the care they receive. She particularly enjoys getting to know her patients and creating a relaxed, reassuring environment where people feel comfortable being themselves. Francesca has a particular interest in nutrition, hormonal health, wellbeing and preventative healthcare, and enjoys learning more about the ways these areas can influence how we feel both physically and mentally. She is passionate about continually developing her knowledge and helping people feel more informed, confident and supported in looking after their health.
Tia Brown
Social & Marketing Lead
Tia is the voice behind our online presence, leading digital marketing and community engagement with creativity and authenticity, ensuring our message reaches and resonates with women across all platforms.
Amy Bold
Senior Administrator
Amy brings over 17 years of experience in office administration to her role as Senior Administrator, including 9 years working on reception. She plays a vital role in supporting both patients and clinical staff, ensuring the smooth day-to-day running of the clinic. Known for her dedication and strong work ethic, Amy takes pride in offering a high standard of service and care. Her warm, friendly personality creates a welcoming atmosphere for everyone who visits the clinic. Whether she’s answering queries, coordinating appointments, or assisting with behind-the-scenes administration, Amy is always ready to help with kindness and professionalism. Her approachable nature and attention to detail make her an integral part of the team, helping patients feel reassured and supported throughout their journey with us.
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Neave Kerslake
Patient Co-ordinator
Coming from a background in recruitment, administration and office support, she has experience working in busy environments where communication, organisation and customer care are key. Friendly and approachable by nature, Neave enjoys helping people feel at ease and creating a warm and positive atmosphere within the clinic.