Our Leadership Team
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Co-Founder and Chief Administrative Officer (CAO) of Encore Healthcare, where she oversees operations, strategic initiatives, and organizational growth while driving alignment with company goals and key objectives.
Keisha began her healthcare career in 2024 as a Respiratory Therapist and quickly advanced into leadership roles. She later became the top Account Executive at global respiratory provider Linde Healthcare, helping develop and expand respiratory-focused programs for skilled nursing facilities across multiple states. Since co-founding Encore Healthcare, Keisha has played a key role in building and scaling the company through operational leadership, innovation, and a passion for improving healthcare outcomes.
In addition to her work at Encore Healthcare, Keisha is actively involved in community leadership, youth athletics, and nonprofit fundraising initiatives throughout the Upper Cumberland region.
Keisha Harper, RT
Chief Administration Officer
Carrie is a proactive leader with strengths in communication, clinical excellence and team collaboration.She is a results-focused senior executive that client customers count on for critical thinking, workflow design and implementing operational and clinical solutions.
Carrie started her career as a Respiratory Therapist in acute care, then expanding into post-acute care where rapidly advanced into various management roles until eventually becoming the National Clinical Operations Manager for The Linde Group. Her awards include recipient of AARC- LTC Practitioner of the Year, Linde’s Ability to Execute and Global Clinical Excellence award and the American College of Chest Physicians – Center of Excellence Award for Sub-Acute Care. Carrie serves as Encore’s VP of Operations and oversees all clinical segments of the business.
Carrie Hylton-Proffitt, RRT,
ACHC Certified Consultant
Chief Operations Officer
Zach is a healthcare executive with two decades of experience in post-acute respiratory care services and outcome-based care models. He grew up in the home care/respiratory industry, as well as a family of successful Respiratory Therapists & entrepreneurs.
After becoming a Respiratory Therapist himself, he worked in Acute Care for 3 years before transitioning back into Post Acute Care. He served as Special Projects Manager & National Clinical Educator for Linde-RSS and served as VP of Health Management & Chief Clinical Officer at Alana Healthcare developing the CROM program that transitioned the company from a Durable Medical Equipment provider in TN into a national Disease Management organization.
Zach started Encore with the vision of radically improving post-acute respiratory care delivery through clinical excellence, innovative technologies, and the Nexus software.
Zach Gantt, RRT, FAARC
President & Chief Executive Officer
Dan has a background in developing respiratory & medical devices while serving in various Executive/Presidential roles with Baxter Healthcare, Sunrise Medical/DeVilbiss, & Sunrise Medical/Quickie. Dan founded Inspired Technologies, a VC funded startup where he developed & patented multiple devices including the SmartDose oxygen delivery conserving device.
Dan then joined Klingensmith Healthcare, developing the most widely known home COPD management program, DASH, which was published 40+ times in all notable US pulmonary journals. Dan guided that business through an acquisition by Highmark BCBS in 2015 & joined Encore in 2016 as Chief Strategy Officer.
Dan Easley
Chief Strategy Officer
Dr. Frederic Seifer presently serves as Medical Director of Population Health, St. Lawrence Health System, Potsdam, NY. Prior to assuming this role, he served as Medical Advisor for Pulmonary Health Innovation for Community Health Systems, Nashville, TN.
Dr. Seifer’s research interests & experience include smoking cessation, pulmonary rehabilitation, chronic obstructive pulmonary disease, bronchiectasis and Idiopathic Pulmonary Fibrosis. After receiving his medical degree from Northwestern University, Chicago, IL, Dr. Seifer completed his internship and residency in internal medicine at the University of Illinois, Chicago. He was a recipient of a NIH supported research pulmonary fellowship at Duke University Medical Center in Durham, NC.
Frederic Seifer, MD, FCCP
Medical Advisor, Population Health
Vice President of Sales
With a career spanning more than three decades in the HME/DME industry, Jamie brings a wealth of versatile leadership experience ranging from early-stage startups to multinational corporations. His broad expertise across software (SaaS), sales management, operations, and retail marketing makes him uniquely equipped to drive growth in modern respiratory technology.
Jamie’s leadership history includes serving as VP of Sales at sovaSage, where he championed AI-based compliance solutions, and spending 15 years at Philips Respironics managing national sales for their premier resupply and adherence services. His foundational roots in the industry date back to a successful decade spent with Pride and Quantum Rehab.
Jamie earned his degree in Economics with a minor in Business from The Pennsylvania State University. Throughout his 30+ year journey, his core focus has remained unchanged: prioritizing patient care and fostering deep, trust-based customer relationships.
Jamie Caputo
Matthew Connerton
VP of Software Development and
Engineering
Matthew Connerton is VP of Software Development & Engineering at Encore Healthcare, where he leads the engineering team behind the company’s population health SaaS platform.
With more than 15 years of experience in Drupal and modern web development, he has worked across front-end, back-end, and DevOps, with a focus on building secure, scalable applications in regulated industries.
He has also helped guide engineering efforts around SOC 2 and HITRUST readiness, bringing a practical, systems-driven approach to security, compliance, and product development.
Katie Pennington
Director of Clinical Operations
With almost two decades of experience in leadership and respiratory care, Katie is a highly driven professional focused on patient outcomes. She began her career in the acute care setting at a level 1 trauma center in East Tennessee. In 2012, Katie made the transition into the SNF industry working in a ventilator unit for six years.
In late 2018, Katie joined Encore and began managing a ventilator unit in East TN. Katie advanced the facility’s ventilator weaning rate by over 50% and moved the facility to the top of the state ERC program rankings. Katie currently serves as the Director of Clinical Operations, overseeing two ventilator units, assisting in the clinical software development and leading software implementation.
Danette Bosveld, CPA
Controller and
Human Resources Manager
As the Senior Accountant, Danette has extensive background working with small and mid-sized companies. A graduate of Metropolitan State College of Denver with a BS in Accounting. She also received her MS in Business Administration from Colorado State University.
She has worked as the Accounts Manager for Macleod Pharmaceuticals (veterinary medicine) and Living Fire Arts Network (non-profit). She has consulted for multiple small start-ups.
In addition to her role as Controller & Human Resources Manager at Encore, she also volunteers accounting support for a local church. She is dedicated, detail-oriented, and committed to seeing Encore Healthcare thrive.
Ambra Brown
Population Health Manager
Ambra Brown is Population Health Manager at Encore Healthcare, where she helps lead strategies that improve respiratory patient outcomes through data-driven care, education, and proactive population health management.
She brings a clinical and operational background as a Registered Respiratory Therapist, along with a Master of Health Administration, and is passionate about helping providers deliver more effective, outcomes-focused care.
Jaydon Pena
Product Manager
Jaydon Pena is Product Manager at Encore Healthcare, where he helps lead product development, project execution, and data-driven decision-making across the organization.
He plays a key role in building systems, improving processes, and translating business needs into solutions that support operational efficiency, customer success, and company growth.
Christine Alexander
Director of Customer Strategy
Christine Alexander serves as Director of Customer Strategy at Encore Healthcare, where she partners with customers to maximize long-term value through strategic business reviews, education initiatives, ongoing training, and growth-focused support. With more than 20 years of DME experience, she brings an enterprise-level perspective grounded in operational leadership, regulatory expertise, and strategic execution, building collaborative partnerships that expand access to care, improve patient outcomes, and support sustainable long-term growth.
Christine earned her Bachelor of Business Administration in Healthcare Management from The University of Alabama. Throughout her career, shehas successfully led multi-state territories, delivering accelerated revenue growth, reduced operational costs, and advancing COPD care through scalable, value-based partnerships. She is passionate about helping providers strengthen operational performance, enhance respiratory care programs, and improve the patient experience through innovation, collaboration, and education.
Joe Kalis
Director of Business Solutions
Joe Kalis serves as Encore Healthcare’s Director of Business Solutions, where he focuses on building the systems, processes, and strategic infrastructure needed to help Encore scale into the future. Originally joining the company in a marketing capacity, Joe’s role quickly evolved into a cross-functional leadership position spanning product strategy, operations, sales enablement, automation, and organizational process development.
With a strong background in branding, direct-response marketing, and business systems, Joe plays a key role in helping align Encore’s technology, people, and workflows around one mission: improving respiratory outcomes while creating scalable, sustainable growth. He is passionate about transforming complex ideas into clear strategies and helping position Nexus as the industry’s leading platform for respiratory compliance, visibility, and operational excellence.