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Michael Everage
Managing Director
Michael joined Landmark in 2004 as Chief Financial Officer. He leads...
Michael joined Landmark in 2004 as Chief Financial Officer. He leads the Company’s efforts in Strategic & Financial Management, Operations, Organizational & Process Improvements, Human Resources, Marketing, and Business Development. His role focuses on infrastructure enhancement, performance tracking and improvement, staff development, policy and compliance, risk management, and new business opportunities. Michael graduated Summa Cum Laude from the University of Colorado at Boulder in 1994 with a Bachelor of Science in Business Administration, concentration in Finance.
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Michael began his career as an Accountant for PEARL iZUMi Technical Wear in Boulder while attending school. In 1995, he began working as a Mergers and Acquisitions Analyst for Putnam Lovell, a Los Angeles-based boutique investment bank specializing in transaction work for investment management companies. In 1998, he joined Rocky Mountain Capital Partners in Denver as a Private Equity Associate where he focused on small to middle market deal evaluation, execution, and portfolio monitoring for institutional SBIC investment funds. In 2001, Michael joined 2nd Edison, a Silicon Valley-based product development and profit recovery firm, as VP of Corporate Development, and in 2003, he joined Markpoint Venture Partners, a Dallas-based seed and early stage venture capital firm, as a Venture Partner. Michael joined Landmark as CFO in 2004, being subsequently promoted to President in 2018 and Managing Director in 2022.
Ron Majerus
Chief Executive Officer
Ron founded Landmark in 1999. He currently leads the...
Ron founded Landmark in 1999. He currently leads the Company’s Sales, Systems Development, Program Management, and Operations. Ron focuses his efforts on building a 'Landmark Level of Service' into all aspects of the Company, developing and implementing proprietary and third-party software solutions, creating business process improvement, leading sales and business development efforts, coaching and mentoring staff, engaging in strategic and financial planning, and ensuring Landmark’s efforts are consistent with the Company’s vision and mission. Ron graduated from the University of Texas at Arlington in 1993 with a Bachelor of Science in Business Administration, concentration in Finance.
Prior to Landmark, Ron was a founder and CFO of GTW Construction, a multi-state commercial construction company with hundreds of employees and contractors. While at GTW, he led the development and management of all departments, including Financial Management, Information Technology, Human Resources, and Operations. Ron left GTW in 1998, founding Landmark in 1999 on the belief that a high touch Homecare service model, combined with best of class systems, would earn the trust of patients and referral sources across North Texas.
Julie Davis
Vice President of Operations
Julie has been with Landmark since 2007 and leads...
Julie has been with Landmark since 2007 and leads Landmark’s front-line Operations Department personnel and supervisors. She is heavily involved in order processing, revenue cycle management, performance improvement, human resources, training, operational configuration, regulatory compliance, insurance network administration, and information system management. Julie studied Biology at Southwest Texas State University.
Julie began her healthcare career in 1992 at Harris Medical Supply where she rose to the position of Billing & Collection Manager. In 2000, she joined Accurate Medical Equipment & Pharmacy as Director of Information Services. While there, she developed reporting structures, managed systems resources, oversaw reimbursement, and monitored Company compliance. Julie began working at Landmark in 2007 as a Quality Control Specialist, and was soon promoted to QC Supervisor, Operations Manager, and Director of Operations.
Lilia Luss
Compliance Officer
Lilia has been with the Landmark since 2015 and manages all...
Lilia has been with the Landmark since 2015 and manages all regulatory compliance and education programs for Landmark Infusion. She performs a broad range of duties, including: quality assurance, education & training, process improvement, corrective action implementation & monitoring, and continually evolving policies and procedure. Lilia received her Bachelor of Science in Pharmacology from the Chemical Pharmacological Institute in St. Petersburg, Russia in 1983. She became a licensed Pharmacist in Texas in 2007, earning her IV certification in 2014.
Lilia began her career by working as a Staff Pharmacist in St. Petersburg, Russia until moving to Dallas in 1998, where she began working as a Pharmacy Technician at Tom Thumb. In 2004, Lilia began working as an IV Pharmacy Technician at Central Admixture Pharmacy Services, and in 2007, was promoted to Staff Pharmacist. In 2008, Lilia joined Walgreens Option Care Pharmacy as a Clinical Pharmacist, was the Pharmacist-In-Charge at CarePoint Partners until 2013, and the Pharmacist-In-Charge at Bioscrip Infusion Services until 2015. Lilia began working at Landmark in 2015 as a Clinical Staff Pharmacist and was subsequently promoted to Pharmacist-In-Charge and then Compliance Officer.
Philly Un
Director of Nutrition Support
Philly Un is the Nutritional Support Pharmacy Manager and has been...
Philly Un is the Nutritional Support Pharmacy Manager and has been with Landmark since 2019. Philly was integral to the creation and management of our Nutritional Excellence Program and currently oversees and manages these initiatives. As a Clinical Pharmacist, she performs Patient assessments and clinical monitoring and addresses the care of Patients receiving nutritional support and TPN home infusion therapy. She enforces the best practice guidelines, manages pharmacy technicians working with TPN Patients, and consistently monitors Patients' nutritional status during home infusion. Philly received her Bachelor of Science degree in Nutrition and Food Science from the University of Houston, her Master of Science in Nutrition form Texas Woman's' University, and her Doctor of Pharmacy from Touro University in California.
After receiving her Pharmacist certification in 2014, Philly began working as a Staff Pharmacist at Pharmaca Integrative Pharmacy in La Jolla, California. In 2015, she moved to Texas and worked as a Staff Pharmacist at Your RX Pharmacy, a specialty non-sterile compounding pharmacy. Philly then worked as a Clinical Pharmacy for Coram, an infusion pharmacy until 2019.
Executive Bios
Ryan Foster
Senior VP of Sales and Business Development
Ryan Foster joined Landmark in...
Ryan Foster joined Landmark in 2022 as the Senior Vice President of Sales and Business Development. Ryan leads Landmark's sales team by developing, managing, and training the Client Relations Directors and Clinical Care Directors. Ryan's role focuses on building relationships with key strategic accounts, developing and implementing strategies to build a strong sales team, and using excellent interpersonal skills with external contacts and internal personnel. Ryan works closely with the CEO and Managing Director on the Company's business plan and goals to drive superior financial results. Ryan graduated from University of Texas at Tyler in 2012 with a Bachelor's of Science in History.
After graduating, Ryan began teaching and coaching in Greenwood ISD in Midland, Texas from 2012 through 2014. After teaching, Ryan decided to enter into the healthcare sales industry. He worked at Aveanna Healthcare from 2014 to 2022. In this position, Ryan strengthened his sales, team-building, and leadership skills. Ryan came to Landmark in 2022 interested in building and developing the sales team and ultimately growing the Company.
Amy Jo Gustafson
Pharmacy Manager
Amy Gustafson joined Landmark in 2025 as our Pharmacy Manager...
Amy Gustafson joined Landmark in 2025 as our Pharmacy Manager. Amy provides value and hands-on management to our Infusion Pharmacy team. She supervises pharmacy personnel and actively participates in the daily operations of the pharmacy. She’ll also monitors timely order processing, helps resolve issues and establishes order priority, and serves as the point of contact until daily pharmacy operations are completed. Amy collaborates with other departments to ensure seamless patient care and operational efficiency
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Amy came to Landmark as a highly skilled pharmacist with a wealth of knowledge and ample experience in infusion pharmacy. Her undergraduate degree was in Chemistry and Spanish before she received her Pharm D. from the University of Nebraska. Amy Jo went to work for Randol Mill Pharmacy where she gained experience with sterile and nonsterile compounding before working for North Texas Infusion and Specialty Pharmacy in 2018. At NTIDC, she worked in multiple areas throughout the pharmacy, from intake, to the clean room, to compliance.
Thomas Vickers
Pharmacist-In-Charge
Tom was promoted to Pharmacist-In-Charge in June 2025 after...
Tom was promoted to Pharmacist-In-Charge in June 2025 after joining Landmark as a Clinical Pharmacist in 2019. As the PIC, Tom holds authority over all areas of the pharmacy including order approval, intake, medication procurement and control, order preparation, and delivery. He manages the pharmacy staff to ensure the pharmacy is operating efficiently and abiding by all policies, procedures, and regulations. He provides management and focuses heavily on compliance while also performing duties as an Intake Pharmacist, communicating with patients and referral partners, and assisting throughout the pharmacy when needed. Tom's experience and leadership throughout his time with Landmark so far has been invaluable.
Tom attended Texas A&M Commerce for his undergraduate degree in Pre-Pharmacy before attending Texas Tech School of Pharmacy where he earned his PharmD. After becoming a licensed Pharmacist, he moved to Anchorage, Alaska where he worked in a long-term care pharmacy for 2 years. Tom then moved back to Texas where he continued working in long-term care before diving into home infusion. Tom worked at Amerita Specialty Infusion Services as a Clinical Pharmacist for 5 years where he gained experience in home infusion, patient care, and IV compounding, before coming to Landmark in 2019.
Amberly Johnson
Senior Pharmacy Manager
Amberly is Landmark's Senior Pharmacy Manager and was...
Amberly is Landmark's Senior Pharmacy Manager and was Landmark's founding Pharmacist-In-Charge when we opened our doors in 2011. Amberly manages daily pharmacy operations, including making organizational and process improvements, managing communication with patients, and creating solutions to provide timely deliveries, coordinated care and a Landmark Level of Service. Amberly possesses a wealth of knowledge and home infusion experience and has been a strong leader and asset to Landmark. Amberly has worked in and managed every area of the pharmacy and therefore, holds a firsthand perspective on pharmacy workflow. Amberly received her Bachelor of Science in Pharmacy from the University of Oklahoma.
After college and becoming a Registered Pharmacist, Amberly worked at Caremark for 5 years where she gained initial experience in home infusion and TPN (Total Parenteral Nutrition). After leaving Caremark, she helped open a pharmacy for another company where she wrote all of the policies and procedures and gained experience as a PIC. She then went to work for Y Medical in 1997, where she was the sole pharmacist and PIC. Amberly then joined Landmark in 2011 and was our founding PIC and sole pharmacist for 4 years. During this time, Amberly worked with the executive team to help create Landmark Infusion what it is today from our creating policies and procedures to communicating with our Patients directly. Amberly has remained flexible, willing to help the team in whatever capacity as we have continued to grow and evolve, and has a true heart for our Patients.
DeTonya Tulsie
Director of Nursing
DeTonya came to Landmark in 2025 as our Director of Nursing...
DeTonya came to Landmark in 2025 as our Director of Nursing. As our DON, she is responsible for the overall management, direction, and leadership of the infusion nursing program, as well as managing administrative aspects of Pharmacy operations. DeTonya came to Landmark with over 20 years of comprehensive, diversified nursing experience and proven performance as a leader and motivator. DeTonya's role is comprised of areas including Clinical Expertise & Leadership, Training & Development, Regulatory Compliance, Operational Management, and Quality Assurance & Improvement, Patient Care, and Collaboration & Communication. DeTonya is a highly skilled medical professional with a compassionate demeanor as well as being a structured leader.
DeTonya received her Associate of Science in Nursing in 2004, her BSN from Texas A&M in 2006, and Master of Science in Nursing – Education from the University of Phoenix in 2007, and her Master of Science in Nursing – Anesthesia from Florida Gulf Coast University in 2010. DeTonya has been working as a Registered Nurse with the US Army Reserves since 2009, serving the United States of America and our soldiers by administering nursing care, emergency medical treatment, and medical monitoring. DeTonya also started working at Fresenius Medical Care in 2011 as a Clinical Nurse Educator and Clinical Manager, before working her way up as an Area Team Lead, then Director of Operations in 2022. DeTonya then went to work for Elevance Health as an Long-term Services Coordination/RN Clinician, performing clinical assessments and providing supervision to other clinicians before coming to Landmark Infusion to lead our nursing department as our Director of Nursing in January 2025.
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McKynna Cocanougher
Director of HR & Communication
McKynna has been with Landmark since 2019. She is responsible...
McKynna has been with Landmark since 2019. She is responsible for recruiting, human resources, and marketing & communication. McKynna works extensively on HR issues, employee onboarding, education and training, digital marketing, company credentialing and employee benefit management. In 2017, she received her Bachelor of Behavioral Science, Magna Cum Laude, from Hardin-Simmons University.
During college, McKynna worked as a Marketing and Social Media Assistant for Hardin-Simmons University under the Director of Marketing. After graduating, McKynna worked for OmniKey Realty as a Marketing and Listing Coordinator, subsequently joining Onyx MD in 2018 as a healthcare recruiter for Physicians of multiple specialties. McKynna also worked as a Dallas Stars Ice Girl from 2017-2019 as a performing ice skater, dancer, and ambassador. She was awarded Miss Abilene 2015 and was a semi-finalist for Miss Texas USA in 2016.
Whitney Inman
Director of Accounting
Whitney has been with Landmark since 2007 and has almost 20...
Whitney has been with Landmark since 2007 and has almost 20 years of accounting experience. Whitney formalizes and manages accounting processes, manages general ledger accounts and underlying schedules and is key in participating system development projects. Whitney also manages purchasing, inventory, and accounts payable functions across the company. Whitney received her Associates of Arts degree from Tarrant County College in 2002, and in 2008 received her Bachelor of Science in Organizational Management, with a minor in English, from Ashford University in Iowa. Whitney began working at Party Wearhouse in Customer Service and Accounting while she was working on her Associates degree. In 2003, she began working at Grand Prairie Ford working in accounting and inventory control for the parts department.
Whitney then began working for Landmark in as an Accounts Receivable Posting Specialist, in 2007 became the Accounts Payable Specialist. Subsequently, she was promoted to Inventory and Purchasing Supervisor in 2010, in 2013 was promoted to Inventory and Purchasing Manager, and in 2022 received a promotion to Accounting Manager.
Jeanie Johnson
Purchasing and Inventory Manager
Jeanie has been with Landmark since 2016 and manages all Pharmacy...
Jeanie has been with Landmark since 2016 and manages all Pharmacy purchasing, inventory, assets, and Pharmacy Technician personnel. She is heavily engaged with vendor relations, drug and component sourcing, cost containment, variance analysis, asset control, contract negotiation, and operational configuration. Jeanie earned her Associate Degree in Occupational Therapy from Clarkson College in Omaha and received her IV certification in 2002.
Jeanie began working as a Pharmacy Technician in 1991 in Hastings, Nebraska at Mary Lanning Hospital and worked as an IV Pharmacy Technician until 2001 at Children's Hospital and Medical Center in Omaha. Starting in 1999, she began working as an IV Pharmacy Technician at FirstChoice Healthcare. In 2002, Jeanie began working as an IV Certified Pharmacy Technician at W-W-B/IVMEDCO, and from 2004 to 2006, Jeanie worked at American Outcomes Management as a Patient Care Coordinator. In 2006, she joined Y Medical Associates, a North Texas home infusion company, as a Certified Pharmacy Technician, leaving in 2016 as Pharmacy Purchaser. Jeanie also worked PRN for Methodist Mansfield Medical Center as a Sterile Pharmacy Technician from 2007 to 2012.