About SustainExis

SustainExis is a boutique strategic advisory firm focused on helping leadership teams navigate complex decisions across strategy, sustainability, and AI.

We work at the intersection of analytical rigor, independent thinking, and real-world execution.

Why we exist

Today's leadership challenges are increasingly complex, interconnected, and uncertain. Strategic decisions are no longer confined to a single domain — growth, sustainability, and technology now shape each other.

SustainExis was founded to help leadership teams make sense of this complexity and translate it into clear strategic direction, informed decisions, and sustainable performance.

Our role is not to provide generic frameworks, but to act as an independent strategic partner — supporting leaders in thinking more clearly, deciding more confidently, and acting more effectively.

Our approach

We combine structured problem-solving with systems thinking and a strong focus on decision impact.

Our work is characterized by:

• Partner-level involvement in every engagement
• Independent and unbiased advisory
• Analytical rigor without unnecessary complexity
• Practical relevance over theoretical models

We do not sell tools, platforms, or implementation services. Our value lies in strategic clarity, critical thinking, and trusted advisory support.

How we work

Rigor, independence, results.

Diagnostic
Structured problem definition and fact-based analysis.
Strategy Development
Strategic options, trade-offs, and scenario-based recommendations.
Implementation
Organizational design, governance, and capability building.
Ongoing Partnership
Trusted advisory support through evolving strategic challenges.

Serhat Erdogmus, Founder

Serhat is a strategy advisor with over 15 years of experience working across corporate strategy, transformation, and business development.

He has led strategic projects across multiple industries, including experience within Big4 consulting environments, combining analytical rigor with practical execution.

His work focuses on helping leadership teams navigate complexity, make better strategic decisions, and build future-ready organizations at the intersection of strategy, sustainability, and AI.

Serhat's approach is grounded in structured thinking, interdisciplinary perspectives, and a strong belief that the quality of decisions ultimately defines long-term performance.

Our principles

Independent thinking
We provide unbiased perspectives, free from implementation or technology agendas.
Strategic clarity
We focus on the few decisions that truly matter.
Human-centered leadership
We believe strategy is ultimately about people, not only systems.
Long-term value
We prioritize sustainable performance over short-term optimization.

Begin a conversation

We work with a limited number of clients each year to ensure senior-level focus and meaningful engagement.

If you would like to explore a potential collaboration, we welcome an initial, confidential conversation.

Serhat Erdogmus, Founder
hello@sustainexis.com LinkedIn
London, UK
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