Daniel Lettenberger-Klein serves as Chief Member and Programming Officer at WellLink Health Alliance, where he leads strategic initiatives that expand national member engagement, strengthen enterprise partnerships, and advance organizational impact across a growing, coast-to-coast network. Working closely with senior leadership to drive alignment, elevate visibility, and position the organization for long-term growth and influence, Lettenberger-Klein plays a key role in cultivating executive relationships, enhancing thought leadership, and supporting cross-sector partnerships that advance health equity and system transformation at scale. With more than a decade of executive leadership experience in both nonprofit and for-profit behavioral health organizations, Lettenberger-Klein has led strategic operations across four multimillion-dollar enterprises.

An entrepreneur and a well-known figure in the healthcare technology community, U.N. has produced impressive results in senior managerial roles at companies including Bayer, United Health Group, Eliza, Wellframe, and several early-stage companies. U.N. brings in-depth clinical healthcare expertise in launching new technologies related to mobile and digital health, multi-modal engagements, predictive modeling, data analytics, and artificial intelligence (A.I.).

U.N. Studied computer science at Wagner College. He is fluent in several languages and is an active voting member of ASTM (American Society for Testing & Materials), which monitors and sets standards for products used in the U.S.

Keith is a seasoned technology executive with a dynamic entrepreneurial background. After earning a Finance degree from Pennsylvania State University, he successfully launched multiple ventures in the Boston area and was a key contributor within the Vista Equity Partners portfolio.

In 2017, driven by personal challenges navigating the healthcare system as both a patient and caregiver, Keith co-founded HealthCorum. His leadership has been instrumental in positioning the company as a trailblazer in the healthcare data analytics space, enabling HealthCorum’s partners to drive greater efficiencies and support the delivery of high-quality care. Keith currently serves as the company’s’ Chief Revenue Officer (CRO), overseeing operations and all market-facing initiatives.

Matt leads engineering at Serif Health, bringing deep experience building clinical and data infrastructure. Prior to Serif, he led clinical software engineering at One Medical, where his team built core HER capabilities, including referrals, orders, and e-prescribing, achieving EPCS and SureScripts certification. 

He has also held engineering leadership roles at Truepic, Dropbox, and Microsoft. Matt holds a BS in Computer Engineering from Northwestern University.

Yossi Abraham holds over 20 years of experience in various managerial roles, mainly in the Telecom and IT industry. Managerial positions include sales and business development, marketing, project management and chief of staff.

As President & CEO of Zappix, Abraham leads corporate strategy, product vision, go-to-market execution, and organizational growth. Over the past several years, a significant part of that journey has been helping the company embrace AI - both within their customer engagement platform and across our internal operations. Zappix leverages AI throughout engineering, customer success, sales, and marketing to improve productivity, accelerate execution, and deliver better customer outcomes.

Rahul Mahadevan, Founder and CEO of WiTT is a Cancer survivor and patient advocate. In 2021, when going through his own Cancer journey, he met patients who were choosing to delay or avoid treatment because they did not have the non-clinical support they needed.

He started WiTT to help address the non-clinical (financial & non-financial) challenges patients faced as they went through treatment with the hope, that by removing these "activities of daily living" challenges, patients could focus on what was truly important — their health.

Rahul has over 23 years of healthcare experience, having worked for multiple vendors (Philips, Siemens) and providers (Stanford Hospital & Clinics, Stanford Children's) during this time. He has a passion for technology, digital health, and oncology and is focused on developing innovative solutions to impact the lives of cancer, and all chronic disease, patients.

Dr. Gorstein joins us through the acquisition of his esteemed firm, Health Innovations, by our shared parent company, Starfish Partners. Health Innovations has long been the go-to resource for organizations transitioning from volume and fee-for-service models to value-based care delivery and Population Health focus.
 
Dr. Gorstein’s impressive academic background includes a BA from Amherst College in 1979 and an MD from NYU in 1983. He completed a surgical internship at Yale in 1984 and a residency in Radiology at Vanderbilt in 1986. Throughout his career, Dr. Gorsteinhas maintained a passion for the cost-effective delivery of quality healthcare.
 
A pioneer in Health Informatics and Clinical Innovation, Dr. Gorstein has provided strategic consulting to nationally renowned healthcare organizations, helping them recruit leaders in clinical innovation and transformation. His expertise and visionary approach will be invaluable as we continue to support our clients in navigating the evolving healthcare landscape.

Russell D. Robbins, MD, MBA is a physician executive and clinical informatics leader with more than two decades of experience shaping how healthcare organizations use data, technology, and patient stories to drive meaningful improvement. His career spans senior roles across health plans, analytics companies, and mission‑driven startups, where he has built scalable programs that elevate patient and caregiver voices while strengthening operational performance.

As an independent consultant, he has worked with Everyday Health to create the Top Hospitals program to help consumers find the facilities that perform selected surgical interventions. He has served as Chief Medical Information Officer at PurpleLab, where he led cross‑functional teams of clinicians, data scientists, and engineers and acted as the organization’s primary clinical spokesperson. His work included designing advanced analytics engines, developing real‑world data methodologies, and translating complex clinical and AI concepts into clear, actionable narratives for executives, clients, and the public. Previously, as Medical Director and AVP of Clinical Informatics at Blue Health Intelligence, he oversaw national analytics initiatives and partnered with health plans to improve quality, cost, and member engagement.

He earned his MD from NYU School of Medicine, an MBA in Health Systems from Union College, and a BA in Biology from Swarthmore College. He completed his residency in Urology at NYU, Bellevue, Manhattan VA, & MSKCC.

Gita Vatave is a seasoned executive with over two decades of experience leading innovation across care navigation, health tech, and employer-sponsored health programs. She brings a proven track record of bridging strategy and execution to drive meaningful transformation in healthcare delivery.

As President of the Care Navigation Division at Wellnecity, Gita is focused on expanding the company’s capabilities in high-touch care navigation—giving this critical solution dedicated leadership and unlocking new ways to support at-risk members. Her work

centers on helping clients reduce complexity, improve outcomes, and deliver measurable value through proactive, data-driven engagement.

Gita’s leadership spans some of the most respected organizations in healthcare. At CareMore Health, she served as Chief of Staff and General Manager, and later as Staff Vice President of Strategic Initiatives—driving operational innovation and program design.

At Employer Health Solutions, she helped launch a unique care delivery model for self-insured employers as Chief Development Officer. She then joined Uniper, where she rose from Vice President of Strategic Accounts to President of North America, overseeing partnerships, growth strategy, and market execution. She is also Co-Founder of EDYou, an education technology platform focused on expanding access and personalization in modern learning.

Gita earned her MPH in Epidemiology from Yale University and her BA in Natural Sciences from Johns Hopkins University.