We go beyond change by putting people at the center

We are specialists in Ethical Change Management. We help people and organizations discover the value of every transformation and build the capacity to evolve consciously, with purpose, dignity, and conviction of their own.

Two Acertare professionals talking during a working session
+20 yearssupporting transformations

More than two decades supporting organizations have taught us that a transformation only truly happens when the people living it find meaning in it. Organizations move forward when people move forward. And people move forward when they feel part of the process, when someone listens to them, when the change speaks to them.

8 countrieswith an active presence across the Americas and Europe.
Europe and the Americasprofessionals certified in DOIT Change©.
Leader supporting a team during a mentoring session

That is what we place at the center of every project we support. An ethical commitment that lives in every decision, every conversation, every step of the process.

Meet the team

Our commitment to excellence

Our internal processes are built to deliver on the value we promise our clients.

Acertare training session
01.

Change Management since 2004, with more than two decades of continuous work in organizational transformation.

02.

Our own methodology, anchored in the Conscious Organizational Evolution Model, with a systemic view and executive alignment.

03.

Presence across Spanish-speaking America, the Caribbean, North America, and Europe.

04.

Qualified Education Provider™ by the ACMP.

ACMP Qualified Education Provider badge — QEP™

Guiding Principles

These principles uphold our commitment to building a fair, inclusive environment for everyone involved in the change process.

1

Empathy

Respect the people affected by change.

2

Recognition

Recognize the dignity of every human being.

3

Significance

Emphasize the need to go beyond oneself and contribute, adding meaningful value.

4

Wellbeing

Prioritize safety, support, and each person’s ability to choose how they respond to change.

5

Distributive justice

No one should be unfairly harmed by the changes we support.

6

Security

Foster conditions of trust and protection so people can move through change with clarity and respect.

Our Team

Mexico · Latin America
Julián Pérez-Duarte Escobar

Julián Pérez-Duarte Escobar

CEO

I founded Acertare in 2004 with one conviction: people don't resist change. They resist the way change is managed. I work alongside leadership teams across LATAM and Europe to manage complex transformations, technology implementations, restructurings, cultural change, where real adoption by people determines whether the project works or not. My premise: people don't need change explained to them. They need the conditions to choose it. That is what guides the DOIT Change© methodology and the way I work with those who are after sustainable results, not temporary compliance.

Miriam Larios Mejía

Miriam Larios Mejía

Managing Partner, LATAM

My focus is on talking with our clients about what matters to them, what they want to achieve, what concerns them, and what evolving or changing actually involves. On that basis, I mobilize and lead our organization so that we are able to deliver a solution and resolve the business and people challenge we are addressing.

Vanessa Guízar

Vanessa Guízar

Operations Director

I lead the operation and the delivery of the commitments Acertare makes to its clients and teams. I am guided by a genuine interest in honoring the value promise we declare in every one of our engagements. My work happens at the intersection of strategy and execution: I translate vision into structure, into team, and into results. For me, that is the most concrete way to make Acertare's purpose real: that organizations don't just change, but learn to move differently.

Leslie Warnholtz

Leslie Warnholtz

Business Development & Operations Director

I connect organizations with the real possibility of changing. My work begins before the project does: in that first conversation where I listen to what a client needs to transform, and in the trust that is built for them to decide to walk it with us. I live at the intersection of human connection and organizational transformation: I turn relationships into commitments, and commitments into results. For me, that is the most concrete way to make Acertare's purpose real: that organizations don't just change, but find in us the partner who helps them move differently.

Europe and strategic partners
Covadonga Perez Riú

Covadonga Perez Riú

Evolution Strategy Director

As Acertare's Evolution Strategy Director in Spain, I open and position the Conscious Evolution and Change Management practice in the Spanish market, generating demand and supporting organizations through their most complex transformation processes. I work with leadership teams to align leadership, drive technology adoption, and manage organizational risk in high-impact initiatives.

Xavier López de Arriaga Delfín

Xavier López de Arriaga Delfín

Managing Partner, Northern Mexico & Global Reach

My concern is always to help organizations evolve without losing sight of the fact that behind every strategy, process, or technology there are people who make change possible. What interests me is supporting leaders as they connect strategy, culture, and talent, turning business challenges into growth opportunities and building organizations that are stronger, more human, and more sustainable.

Philippe Bourgeois

Philippe Bourgeois

Strategic Partner

Fifteen years ago I left the corporate world to help leaders navigate change, and I have stayed close to them ever since: supporting them through restructurings, leadership transitions, stages of accelerated growth, and the cultural shifts that inevitably come with those processes. I never start with a plan; I start with a conversation, to understand what is really at stake for the people involved. That is the approach I bring: treating business results and human reality as one and the same challenge, not two separate problems.

Ernesto Solari

Ernesto Solari

Strategic Partner

My career has been built around one passion: helping people thrive through change. Over the past 25 years, I have led organizational change initiatives across diverse industries and cultures, driving digital transformation, business modernization, and organizational effectiveness. Whether guiding executives, designing adoption strategies, or training the next generation of HR professionals at McMaster University, I believe the success of change is measured not only by project delivery, but by the trust, the capabilities, and the commitment people build along the way.

Thomas Kostrzewa

Thomas Kostrzewa

Strategic Partner

I work at the intersection of change architecture, accountability in service, and organizational transformation. Through our alliance with Acertare, I support ethical, people-centered transformation processes, helping leaders connect Change Management practices with clarity in service, accountability, and sustainable adoption, grounded in ACMP's change management standard.

Two decades of impact

+20 years
driving ethical transformations
8
countries with an active presence
Europe and the Americas
professionals certified in DOIT Change©

Global Presence

We support transformations across the Americas and Europe, in person, hybrid, and virtual.

Mexico United States Canada Chile Spain France Germany Switzerland

Let’s talk about your next transformation

Meet the people behind Acertare and see how Ethical Change Management can support your organization.

Contact us