Dr. Haviva Malina is a licensed emergency medicine physician with more than 15 years of experience caring for patients in high-acuity settings. She graduated Phi Beta Kappa, Summa Cum Laude, from Barnard College of Columbia University, receiving departmental honors in Psychology and earned her medical degree from Albert Einstein College of Medicine. She completed her Emergency Medicine residency at the Jacobi/Montefiore program.
Dr. Malina became a proponent of ketamine therapy after seeing its rapid and meaningful impact on patients with treatment-resistant depression, anxiety, PTSD, and other mood disorders—particularly during the mental-health crisis of the COVID-19 pandemic. At Keta Medical Center, she leads with a focus on patient safety, compassionate care, and improving access to evidence-based treatments including Spravato®.

Dr. Cheryl Malina, a board-certified emergency medicine physician, is the co-founder of Keta Medical Center. With over 15 years of experience, Dr. Malina has practiced extensively in hospitals across the Bronx and Westchester. She graduated Phi Beta Kappa from Barnard College at Columbia University and earned her medical degree from Albert Einstein College of Medicine, completing her residency at the Jacobi/Montefiore Emergency Medicine Program. Dr. Malina later moved to attending physician roles at several hospitals, most recently as an attending physician at the Good Samaritan Hospital in Suffern, New York.

Dr. Malina’s interest in ketamine therapy was sparked during the COVID-19 pandemic, as she observed a surge in acute psychiatric cases. Impressed by the rapid, positive changes ketamine brought about in patients she became a strong advocate for its use in treating conditions like depression, anxiety, and PTSD.

Moshe Malina is the CEO of Keta Medical Center. Prior to joining Keta, he spent more than 20 years at Citi in senior leadership roles across technology and legal departments. Most recently, he led a global team responsible for major technology transformations and remediation initiatives. Earlier in his tenure, Moshe served in Citi’s legal department, where he managed teams overseeing patents, mergers and acquisitions, venture investments, and complex tech transactions, and served as general counsel of Citi Ventures, the firm’s corporate venture arm. He began his career as an attorney at Cleary Gottlieb. He holds a Juris Doctor from Columbia Law School and a Bachelor of Science in Chemical Engineering from Columbia Engineering.

As COO, Rachel Olstein Kaplan leads operations and growth strategy for Keta Medical Center. She is passionate about ensuring that more people have access to high-quality, compassionate and effective mental health care. Rachel previously founded and ran Aurora Marketing, and spent seven years at Wix.com. She has served as vice president of marketing at StuffThatWorks, a startup using AI-powered crowdsourcing to help patients identify effective treatments for their conditions, and consulted for KHealth, where she helped build their digital library of healthcare resources. Rachel brings over a decade of experience at the intersection of healthcare, technology, and marketing.

Yoni Bak has over 25 years of construction management experience and a background in civil engineering. He will be overseeing the expansion of the practice into new markets in Long Island, Westfield, NJ and NYC. Yoni is committed to making sure all new offices provide the same warm and pleasant environment our patients have come to expect from Keta Medical Center. Yoni will also be coordinating the implementation of management technology to streamline business operations. Yoni lives in NJ with his wife, 4 children and Bichon-Poodle.

Luke brings years of experience in recruitment, talent strategy, and human resources leadership within healthcare and professional services. Before joining Keta Medical Center, he spent six years with The Nautical Group, supporting major health systems and corporate clients nationwide. His background also includes recruitment and HR roles with Memorial Sloan Kettering, Northwell Health, and Carson Tahoe Health. At Keta Medical Center, Luke oversees hiring, employee relations, onboarding, and benefits across all locations. He is passionate about building teams that reflect compassion, collaboration, and innovation in mental health care.

Jessica Yankus is a marketing and provider engagement leader at Keta Medical Center, bringing over 15 years of experience in healthcare, behavioral health, and neuroscience. Her work has focused on expanding patient access and driving provider adoption across innovative mental health treatments, including SPRAVATO and ketamine-assisted therapy programs.

Jessica specializes in building referral networks, developing outreach strategies, and translating complex clinical concepts into meaningful, provider-facing engagement. She is particularly passionate about improving access to care for patients who are not responding to traditional treatment and helping clinicians integrate new tools into their practice.

She holds a Master's of Public Health from Boston University and is currently pursuing a License in Mental Health Counseling. Based in Westchester, New York, Jessica is driven by a commitment to advancing the future of mental health care through both clinical understanding and real-world application.

Amy is a seasoned Human Resources leader with more than 15 years of experience aligning people strategies with business goals and partnering closely with senior stakeholders to drive organizational success.

She enjoys building trust, navigating complex challenges, and delivering thoughtful, data‑informed solutions that support both employees and the enterprise.

With a career rooted largely in the healthcare industry, Amy brings deep expertise in compensation and benefits, recruiting and talent acquisition, employee relations, workforce planning, and organizational development. She excels at providing strategic counsel to business partners, leading through change, and creating HR programs that enhance engagement, retention, and performance.

Beyond her professional accomplishments, Amy is passionate about fostering inclusive, people‑first cultures and mentoring emerging HR talent.

Outside of work, Amy enjoys spending time with her family, exploring new places and reading.

Orli Tesler leads the Insurance and Billing team at Keta Medical Center, ensuring the department operates efficiently through structured systems, clear communication, and strong collaboration. Before joining Keta, she spent over a decade in research and development, where she led production teams, built operational frameworks, and translated complex ideas into scalable, efficient systems.

That foundation in design and production process optimization shapes her approach to healthcare operations, where she prioritizes organized systems, seamless data coordination, and communication alignment between the billing team, management, and clinical staff. Her leadership focuses on bringing clarity, structure, and empathy to support both the team and patient care.

Outside of work, Orli enjoys yoga, gardening, and spending weekends camping with her family, always starting the day with a strong cup of coffee.

Sofia Japal brings a background in marketing and psychology and is deeply driven by the mission of expanding access to high-quality mental health care through marketing. Sofia holds a B.A. in Psychology and Graphic Design from Binghamton University. She grew up in Ossining, a river town in Westchester County, and currently lives in Queens. Outside of work, she enjoys cooking, learning and practicing wellness, and making art. She’s eager to contribute to Keta Medical Center's growth and marketing efforts!

Sara joins Keta Medical Center as an operations coordinator, bringing a strong background in project management, process improvement, and organizational excellence. She is known for her keen attention to detail and ability to manage complex initiatives efficiently and thoughtfully. Prior to joining Keta Medical Center, Sara supported several nonprofit organizations across a diverse range of projects, including complex travel programs, large-scale events, and organization-wide process improvement initiatives. She also has private-sector experience in the medical e-commerce space, further strengthening her operational and cross-functional skill set. With an undergraduate background in psychology and economics, Sara is excited to contribute to work that aligns her passion for improving mental health with her love of building clear, effective organizational systems. When she’s not streamlining processes or managing complex project lifecycles, Sara enjoys cooking, shopping, and traveling.