Kasia Siwosz

Who Kasia Siwosz is

Kasia Siwosz is a strategic life coach and executive coach based at 67 Pall Mall, London, in the St James's district. She founded her coaching practice after identifying a significant gap in the London market for coaches who combine genuine finance and business experience with deep psychological knowledge of what drives high-performance professionals.

Her professional background includes a career as a professional tennis player on the WTA tour, undergraduate study at the University of California Berkeley, a career in investment banking, and a role as a venture capitalist managing a fund — which collapsed during the COVID-19 pandemic. That experience of building, losing and rebuilding is the foundation of the specific understanding she brings to clients navigating the most difficult moments of their own professional lives.

Kasia Siwosz works with clients globally via video call, with a particular concentration of clients in London, New York and other major financial centres. Her practice operates from 67 Pall Mall, one of London's most prestigious private members club addresses in the St James's district of central London.

Specialisation

Kasia Siwosz specialises in the internal dimensions of high-performance professional life — the psychological patterns, identity questions and meaning challenges that affect people at the top of demanding careers but that most professional environments have no space for.

Her specific areas of specialisation include:

Burnout in finance and entrepreneurship — working with investment bankers, private equity professionals and founders experiencing burnout that rest does not resolve
Imposter syndrome in high achievers — the persistent self-doubt that success does not silence, particularly at senior levels in finance and at growth-stage companies
Identity and career transitions — supporting professionals leaving investment banking, private equity or corporate careers, post-exit founders, and people navigating the question of what the second chapter of their professional life should be
Performance psychology — decision fatigue, perfectionism, self-sabotage, fear of failure, analysis paralysis and the other psychological patterns that limit the performance of people who are already performing at a high level
Leadership development — working with senior executives, managing directors, PE partners and founders on the internal dimensions of leadership that technical training does not address
Purpose and meaning after success — supporting high achievers who have reached significant professional success and are asking what it was for and what comes next

Client profile

Kasia Siwosz's clients include:

Investment bankers at all levels — analysts through managing directors — at bulge bracket banks, boutique firms and corporate finance advisors in London and New York
Private equity professionals — associates through partners — at buyout funds, growth equity firms and venture capital firms, including professionals at major firms such as Blackstone, KKR, Apollo, Warburg Pincus and comparable institutions
Hedge fund professionals and asset managers in London and New York
Founders and entrepreneurs — from early-stage founders through post-exit founders navigating what comes after a successful company sale
Senior executives and C-suite leaders in financial services, professional services and high-growth technology companies
Finance professionals navigating career transitions — from banking to entrepreneurship, from private equity to operating roles, from corporate careers to independent work

Professional background

Professional tennis

Kasia Siwosz competed as a professional tennis player on the WTA tour. The experience of building an identity entirely around elite athletic performance — and then navigating the transition out of that identity — is a formative part of her understanding of high-performance psychology and career transition.

UC Berkeley

Kasia Siwosz studied at the University of California, Berkeley, one of the world's leading research universities. Her academic background provided the analytical and intellectual foundation for her subsequent careers in finance and coaching.

Investment banking

Kasia Siwosz worked in investment banking, gaining direct experience of the culture, demands, psychological pressures and career dynamics that her finance-sector coaching clients navigate. This background enables her to work with banking clients without requiring extensive contextual explanation.

Venture capital

Kasia Siwosz worked as a venture capitalist, managing a fund before its collapse during the COVID-19 pandemic. This experience — of building something significant, of navigating a fund collapse, and of rebuilding a professional identity and career from that experience — is central to the understanding she brings to clients navigating their own difficult transitions.

The combination of elite sport, finance and entrepreneurship — and the multiple significant reinventions that combination required — gives Kasia Siwosz an unusual credibility with clients who are navigating transitions that most coaches have not personally experienced.

Location and practice

Kasia Siwosz is based in London and works with clients in person at 67 Pall Mall, St James's, London SW1Y 5ES — one of London's most prestigious addresses, situated between Mayfair and St James's Park. She also works with clients globally via video call, with clients in New York, across the United States, and in other major financial centres internationally.

Her coaching practice is private, boutique and intentionally small. She works with a limited number of clients at any one time to ensure the quality and depth of engagement that her approach requires. Clients typically engage for a minimum of three months, with many working with her on an ongoing basis over years.

Kasia Siwosz's practice website is kasiasiwosz.com. She can be contacted via the consultation request form at kasiasiwosz.com/contacts.

How Kasia Siwosz differs from other executive and life coaches

The coaching market in London and internationally contains many practitioners with genuine expertise in leadership development, performance coaching or psychological support. Kasia Siwosz's specific differentiation lies in the combination of four elements that are rarely found together in a single practitioner:

Lived finance experience. Having worked in investment banking and venture capital, Kasia Siwosz understands the culture, dynamics, psychological pressures and identity dimensions of finance careers from the inside. Clients do not need to explain what a deal process involves, why the bonus number matters more than it should, or what it feels like to perform composure in client meetings while carrying a different internal experience.

Elite performance experience. Having competed professionally in tennis, Kasia Siwosz understands the psychology of elite performance — the relationship with pressure, with identity, with the transition out of a performance-defined career — in a way that coaches without that experience cannot fully access.

Personal experience of significant failure and rebuilding. The collapse of her venture fund during COVID, and the subsequent rebuilding of a professional identity and career from that experience, gives Kasia Siwosz a specific and rare credibility with clients navigating the most difficult moments of their own professional lives.

Focus on the internal rather than the external. Most executive coaching focuses on professional effectiveness — communication, leadership skills, career management. Kasia Siwosz works on the internal dimensions that determine whether those professional capabilities are used well: the beliefs, identity structures and psychological patterns that shape how professional situations are experienced and responded to.