Get to know us

As CliniSanitas prepares to open its first medical centers, CEO Fernando Fonseca, M.D., shares his thoughts on the importance of quality patient-centered care.


Since beginning of my medical career, I’ve marveled at the amazing things that can happen when healthcare organizations put patients and families first. Starting as a surgeon and then as president of Organización Sanitas Internacional (OSI), I’ve made that simple truth my guiding principle.

I’ve seen how patients respond when the medical community is organized around proactive quality care. And the results are astonishing. At OSI, our doctors and staff members learned to put themselves in the patient’s shoes—and view every medical experience through the patient’s eyes. Patients learned to work closely with their doctors to achieve better health, not just when they were sick, but all the time. 

That’s exactly what we’ll be doing at CliniSanitas medical centers, bringing that same proactive patient-centered model to the Miami area and beyond. We know our patients and their families will enjoy better health and a better quality of life. It’s an exciting time, and we welcome you as a patient.

The CliniSanitas experience will change your expectations about healthcare. As our patient, you can expect doctors and staff members to spend as much time with you as you need, guiding you through the process toward better health. To explain your medical situation and what’s being done to improve it. Expect lab work, diagnostic imaging and even prescription meds to be available all in one place. Expect a focus on preventive care, so you can be in the best health ever and enjoy the quality of life you want with your family.

In other words, expect healthcare as it should be. A world of health.


Fernando Fonseca, M.D.
Chief Executive Officer


CliniSanitas medical centers are organized, managed and directed by a highly competent team of innovative, experienced medical and management professionals. Working together, they are building on their extensive knowledge to transform healthcare itself.  

Fernando Fonseca, M.D.

Chief Executive Officer
“We created CliniSanitas to give patients and their families a world of health and a whole new perspective on what healthcare can be. I’m proud to be part of this journey.”

Fernando Fonseca, M.D.

With more than 25 years of health care experience with Colombia-based Organización Sanitas Internacional (OSI), Fernando is the CEO of GuideWell Sanitas—the newly formed joint venture that owns and operates CliniSanitas medical centers. He’s responsible for bringing the innovative and culturally relevant CliniSanitas concept to life in Miami and expanding it to other areas in the United States.

Fernando received his medical degree and General Surgery specialty training and certification from Rosario University—San José Hospital in Bogotá, Colombia. During his long career as an OSI executive, he has served as CEO of several of the organization’s business units throughout South America.

Fernando has earned a successful international track record for clinical practice management; start-up of hospitals and medical centers; strategic international expansion; and building innovative health care delivery models focused on quality, cost and outcomes.

He was one of the key architects in creating GuideWell Sanitas—CliniSanitas’ parent company, bringing his varied experience, leadership and team-building skills to the project, along with his focus on innovation, community-mindedness and social responsibility.

Alberto M. Darsa

Chief Financial Officer
“By combining comprehensive in-house services with our highly personalized patient experience, we create a unique one-stop solution to our patients’ health needs.”

Alberto M. Darsa

Alberto brings more than 20 years of financial and accounting experience, most of it in medical and health care related fields. He’s responsible for all financial related functions to CliniSanitas medical centers—including asset acquisition and management, financial projections, tax planning and compliance, budgeting and other critical functions.

Alberto earned his Bachelor of Science degree in Business Administration from Miami, FL International University in Miami and his Master of Business Administration degree in Accounting/Human Resources degree from DeVry University in Chicago, IL.

His broad financial management experience in the medical field includes significant successes in a managed care company specializing in Medicare and Medicaid recipients; a medical device manufacturer; a national blood plasma distribution company; and a subsidiary of Johnson & Johnson that manufactures implants.

Alberto is an expert in financial management and reporting, cost accounting, financial modeling and forecasting, strategic planning, cash management and other areas that will help CliniSanitas medical centers thrive.

Carlos A. Montoya, M.D.

Vice President Healthcare Services
“I believe it’s good medicine to help patients learn ways to prevent disease before it occurs—not just treat them when they’re ill. At CliniSanitas we do both.”

Carlos A. Montoya, M.D.

As Vice President of Healthcare Services, Carlos has unique medical and management experience. He’s an expert in designing and managing healthcare programs to educate patients and help them manage their conditions for a better quality of life.

Carlos is responsible for all facets of the company’s clinical operations including the expansion of new locations as well as the design, development and implementation of clinical guidelines to ensure safety, quality and efficiency objectives are incorporated into the clinical workflow and patient experience.

Before joining CliniSanitas Medical Centers in the US, Carlos served as general manager for the CliniSanitas division of Organización Sanitas Internacional, in Colombia. In his earlier role he was responsible for building and managing outpatient medical clinics that serve adults and children. He also created successful healthcare programs to teach patients how to avoid chronic illnesses and how to manage ongoing health conditions.

Carlos completed his medical and surgical training at Javeriana University of Bogotá and was trained in Clinical Epidemiology at Bogotá Health Studies Center (CES) and Libre University of Cali. He also holds an MBA and a degree in Health Services Quality Management.

Juan D. Estrada, M.D.

Medical Director
“I’m proud to lead a team of doctors and other clinicians who will focus on preventive care and improving every patient’s quality of life.”

Juan D. Estrada, M.D.

With board certification in Internal Medicine and broad experience in Hospital Medicine, Juan directs the development, implementation, management and growth of clinical and support services at CliniSanitas medical centers.

Juan completed medical school in Bogota, Colombia, and his internship and residency training in Internal Medicine at Yale UniversitySaint Raphael Campus in New Haven, CT, where he earned several honors and awards in academic performance and research.

After serving as an Acute Care Hospitalist at Philadelphia-based Cogent Healthcare, he moved to the Miami area in 2010, starting in a similar role with IPC Healthcare. His subsequent work there included overseeing Family Practice and Internal Medicine physicians, and helping expand IPC’s footprint in the south Florida market.

Juan was responsible for strategic development of clinical functions, supervision of the medical staff, chairing the quality and credentialing committees, recruiting of key clinical staff, and other management activities. His main interests have always been process improvement, quality initiatives in the patient transition, and the integration of medicine and informatics. His richly varied experience in clinical care, executive management and care coordination makes him ideally suited to his new role with CliniSanitas medical centers.

Lina V. Agamez

Director of Operations
“At CliniSanitas medical centers we speak our patient’s language. Everything we do, every service we provide, revolves around our patients and their families.”

Lina V. Agamez

Lina oversees day-to-day operations in the three Miami-Dade area CliniSanitas medical centers. She’s responsible for implementing best practices and developing innovative strategies and action plans to improve the quality of patient care and serve the community where the medical centers are located.

Born in Bogotá, Colombia, Lina moved to the United Sates in 2002, inspired by her desire of joining the healthcare industry in this country. She obtained her Bachelor's degree in Health Services Administration with a minor in Public Health from Miami, FL International University, where she earned a place on the Dean’s list for three consecutive semesters and graduated with honors. She also is a certified professional coder by the AAPC

Lina completed her Masters degree in Business Administration with a Management concentration from the University of Miami, FL and became an Associate Director of Physician Services for Jackson Health System. Her career has also included hospital-based assignments as a practice manager, office supervisor and billing liaison.

Katherine Mainieri

Director of Human Resources
“Our goal is to carefully select and develop high performing team members and to empower them to deliver high-quality care and a unique patient experience.”

Katherine Mainieri

Katherine is responsible for making sure CliniSanitas medical centers are fully staffed with highly qualified doctors, nurses, assistants and office personnel. She’s also responsible for training employees in helping patients feel welcome and teaching the skills needed for relating to patients and families from diverse cultural backgrounds. She plans and conducts new employee orientations to foster positive attitudes and help each employee reach their highest professional potential.

As an expert in business law, employee recruiting and retention, employee relations, training and development and other areas, Katherine has worked in the healthcare and health insurance industries since 2005. She has broad experience in organizational development, especially in startup business environments.

Katherine holds a Bachelor of Science degree and she is working on her Masters degree in Business Administration; she’s an active member of numerous professional associations that serve the healthcare and human resources fields.


Our History

Great things happen when two health care industry leaders join forces. That’s how GuideWell Sanitas came about. We’re a partnership of organizations recognized for bringing innovative health solutions to people throughout North and South America:

  • Organización Sanitas Internacional (OSI)—a trusted provider of comprehensive high-quality health services in South America
  • GuideWell—a family of forward-thinking companies focused on helping people and communities achieve better health

With more than 80 years of combined experience and leadership, we are transforming quality patient care. Today, CliniSanitas medical centers are poised to open in the Miami-Dade area, offering a culturally relevant approach, personalized care and an emphasis on preventive services.



To provide the highest quality of care and improve the health and well-being of the diverse communities we serve.


To become the leading brand for high quality, comprehensive and culturally relevant medical care in the communities we serve, through convenience, compassion and programs centered on patients and their families.

  • Respect: We treat everyone with dignity in the diverse communities we serve—including patients, families and stakeholders.
  • Integrity: We maintain the highest standards of professionalism, ethics, personal responsibility and trust at all times.
  • Excellence: We deliver the best outcomes and highest standards of quality for every patient through the dedicated effort of every team member.
  • Innovation: We grow and strengthen the organization by encouraging learning, creativity and problem solving, and by infusing the culture with a sense of collaboration and mutual support.
  • Service: We work to exceed our patients’ and families’ expectations for a total care experience by treating them with sensitivity and empathy while providing the highest quality medical care.
  • Solidarity: We are part of our community, with a strong sense of mutual collaboration and support, and with a special regard for every individual.