030 290 6100
info@improven.nl
EN 
NL One team, one task!
At TLAB, we are more than colleagues - we are a team connected by a shared mission: to create real impact by taking leaders, teams and organisations to the next level. We believe in the power of people, and that starts with ourselves. Everyone within TLAB brings his or her unique talent and background, and it is this diversity that makes us strong and innovative. Together, we shape change by focusing on what really makes a difference: behaviour, leadership and team dynamics.
Justa de Graaff
Heads cool, hearts warm.
With a keen eye for both strategy and human dynamics, Justa is the booster who gets leaders, teams and organisations moving. A former top athlete, Justa understands better than anyone the power of a good team and the unique...
With a keen eye for both strategy and human dynamics, Justa is the booster that sets leaders, teams and organisations in motion. As a former top athlete, Justa understands better than anyone the power of a good team and the unique value of each individual. She combines focus with connection and does not shy away from complex change processes. Whether leading mergers, breaking through stagnation or building resilient teams, Justa brings out the best in people and organisations. Her motto? Moving forward together, no one gets left behind.
What makes her unique? Justa does not bet on sticking plasters, but on sustainable change. Her strength lies in connecting people and performance: strengthening leadership, making teams flourish, and translating strategy into real impact. Always with an eye for the undercurrent, because that is where the real magic happens. Justa combines her incisive approach with an infectious enthusiasm. She brings structure and calm to chaos and transforms impossibilities into opportunities.
Martijn Visser
Zonder focus, geen resultaat
Martijn krijgt energie van transformaties die écht impact maken. Hij versterkt organisaties door verbinding te creëren, richting te geven en samenwerkingen te optimaliseren. Martijn is sterk in het brengen van focus, zorgt voor draagvlak…
Martijn is energised by transformations that make a real impact! He strengthens organisations by creating connections, giving direction and optimising collaborations. Martijn is strong in bringing focus, ensuring support and translating complex issues into concrete solutions that work. With his broad consultancy experience and sharp vision, he quickly makes connections and knows how to strengthen teams and get organisations moving. Martijn is proactive, listens carefully and knows how to translate the core of every issue into action.
His approach? Clear, results-oriented and with a keen eye for people. With energy, focus and decisiveness, Martijn makes transformations permanently successful!
Heleen de Kievith-Tollenaar
Clear without harshness, mirroring without breaking.
Heleen combines decisiveness with creativity and pragmatism. She moves effortlessly between strategy and intuition and brings about sustainable change by connecting hard structures and soft dynamics. With a ...
Heleen de Kievith-Tollenaar
Clear without hardness, mirroring without breaking
Heleen combines decisiveness with creativity and pragmatism. She moves effortlessly between strategy and intuition and brings about sustainable change by connecting hard structures and soft dynamics. With a sharp eye, she sees through patterns, identifies what is really going on and creates movement - not by forcing, but by asking exactly the right questions at the right moment.
Change goes beyond plans and processes; it is about the people who carry it. Heleen ensures that people understand, embrace and find their way through the change. At the same time, she structures and makes change tangible and achievable. She takes organisations through transformations, from steering committee to operations, and ensures impact at all levels.
Change succeeds when people identify with it and want to contribute to it. Heleen guides leadership and team development with an eye for balancing individual ambitions and collective goals. Not by pushing, but by reflecting and creating space. When people recognise their strengths and weaknesses, real change - from the inside out - emerges. Not a one-off impulse, but a transformation that lasts.
Biene van Kooten-Gosses
Stand strong, make an impact.
Biene is a leadership and team development consultant/facilitator. She helps organizations, leaders, and teams navigate through different growth phases and deal with change — by engaging in real conversations and tapping into collective wisdom. By helping them...
Biene is leiderschap- en teamontwikkeling consultant / facilitator. Zij helpt organisaties, leiders en teams navigeren door verschillende groeifases en omgaan met verandering. Door het echte gesprek te voeren en de collectieve wijsheid te benutten. Door ze te helpen stevig te staan, waardoor ze impact hebben.
Met oog voor zowel de opgave als de mens, gelooft zij in gelijkwaardige samenwerking als grondhouding voor een lerende en innovatieve organisatiecultuur, waarin talentontwikkeling en performance hand in hand gaan.
Biene wordt gewaardeerd om haar doelgerichte en praktische aanpak. Zij heeft een luisterend oor en scherp oog voor context, relaties en samenwerking. Zij houdt van eerlijkheid, denkt oplossingsgericht en verbindt altijd de boven- met de onderstroom. Deze aanpak zorgt voor werkelijke verbinding, wezenlijke verandering en toekomstbestendige groei.
Menno Olgers
Bold, thoughtful and always forward-looking.
For 22 years, Menno has been exploring the core of what makes teams and organisations exceptional. He worked with companies and teams all over the world and discovered that there is indeed a formula for high-performing teams. With a strong...
For 22 years, Menno has been exploring the core of what makes teams and organisations exceptional. He worked with companies and teams all over the world and discovered that there is indeed a formula for high-performing teams. With a strong technological base and a passion for leadership, culture and human behaviour, Menno reduces complex issues to their essence. His approach is daring, thoughtful and always future-oriented.
Menno lived and worked as an expat outside the Netherlands for 15 years, where he led complex transformations and prepared organisations for the future. His experience in connecting technology, people, culture and organisation makes him an indispensable link in the new era where AI is increasing the pressure for transformation by the day. Apart from his work, Menno enjoys his family and gets as much energy from the game on the football pitch with the veterans as from his work.
Sandra Brouwer
Brings teams into motion and brings change to life.
Sandra sees what’s really going on within organizations and gets teams moving with calm, clarity, and a deep sensitivity to underlying dynamics. She explores where the friction lies and facilitates how to move through it together. No quick fixes, but lasting change that…
Sandra Brouwer
Brengt teams in beweging en verandering tot leven
Sandra ziet wat er écht speelt binnen organisaties en brengt teams in beweging met rust, scherpte en gevoel voor de onderstroom. Ze onderzoekt waar het schuurt en faciliteert hoe je daar samen doorheen beweegt. Geen snelle oplossingen, maar duurzame verandering die van binnenuit komt.
Met haar analytisch vermogen en warme aanpak maakt ze complexe vraagstukken behapbaar en gedrag bespreekbaar. Ze versterkt de samenwerking, vergroot eigenaarschap en zorgt dat verandering écht landt. Daarbij verbindt ze de veranderambitie van de organisatie met wat er in teams leeft.
Sandra gelooft dat transformatie ontstaat wanneer mensen zelf de regie nemen over de weg vooruit. Ze is een aanjager, facilitator en sparringpartner in één. Ze laat mensen ervaren dat het écht anders kan en helpt ze ontdekken hoe. Wat haar drijft? Mensen het lef en het vertrouwen meegeven om nieuwe manieren van samenwerken in organisaties mogelijk te maken.
Ingrid Eikelboom
Order in chaos, strength in change.
Ingrid is a seasoned change manager and a rock for any team going through change. She effortlessly puts her finger on the sore spot, without it hurting, and knows how to move teams forward with confidence....
Ingrid is a seasoned change manager and a rock for any team going through change. She effortlessly puts her finger on the sore spot, without it hurting, and knows how to move teams forward with confidence. Structure is her middle name, she translates complex issues into clear solutions and ensures that changes are not just thought up, but actually work. Ingrid doesn't run away from anything, except when she encounters wild boar during her run. Her strength? Sharp insight combined with a gentle, connecting approach.
Monique Koen
Business and humanity balanced.
Monique is an experienced interim manager, leadership coach and business expert. From boardroom discussions to guiding teams through challenging transformations, Monique knows how to bring structure to chaos as well as results...
Monique is an experienced interim manager, leadership coach and business expert. From boardroom discussions to guiding teams through challenging transformations, Monique knows how to bring structure to chaos while achieving results. She uniquely combines hard business results and soft human values. Monique knows how to connect people and perspectives, create clarity in complexity and challenge the status quo. With her sharp vision and empathic approach, she dares to make the unspoken open for discussion - always with a touch of humour.
Monique believes leadership is about inspiring, not power. She helps professionals and organisations grow by harnessing the power of differences and teaching teams how personal leadership leads to collective impact. As a mother and professional, Monique understands the importance of creating an environment where everyone - from colleagues to children - feels seen and valued. For her, authenticity is not a buzzword, but a lifestyle.
