Plaza Companies' leadership is committed to building partnerships and relationships in the industries we serve, as well as in the communities where we do business.

Executive Leadership

Sharon Harper

Chairman & CEO

As CEO, Chairman and Co-Founder of Plaza Companies, Sharon Harper oversees all facets of company operations, including the ownership, development, leasing or management of nearly 13 million square feet of Arizona urban transformational projects, medical healthcare companies, senior living communities and bioscience centers.

Download full bio/Download vCard

Jon Stelzer

Senior Vice President Design and Construction


Jon Stelzer joined Plaza Companies in 2007, following more than two successful decades in project management and the construction industry. Mr. Stelzer’s primary responsibilities with the firm include overseeing the companies’ construction of medical, office, healthcare and senior living facilities. He and his team work closely on a wide range of projects, including small physician office remodels, full blown tenant improvement projects and various office clamshell and senior living ventures.

Download full bio/Download vCard

Ginger Stevenson

Chief Accounting Officer

Scott Rubin

Executive Managing Director of Asset Management Services


Scott Rubin has been with the Plaza Companies for more than fifteen years, and currently serves as the Executive Managing Director of Asset Management, and member of the companies Executive Council. Mr. Rubin is responsible for the oversight and performance of Class A Office and Medical Office properties, and includes over 1.5 million square feet of space. Scott is also responsible for the underwriting and asset management decisions for Plaza Companies owned properties.

Download full bio/Download vCard


Margaret Lloyd

Senior Vice President Brokerage Services


Margaret Lloyd is Senior Vice President of Brokerage Services with the Plaza Companies. She has spent more than three decades in the commercial real estate industry in Arizona. Since joining Plaza Companies in 2010, she has focused on leasing and sales of more than 750,000 square feet of medical office properties, and she also serves on the Healthcare Leadership Council for GPEC.

Download full bio/Download vCard

Bill Cook

Senior Vice President Brokerage Services


Bill Cook is Senior Vice President of Brokerage Services at Plaza Companies. Bill has been with Plaza Companies since 2013, originally starting in the construction management department. Bill transitioned to the brokerage team in 2014 with a focus on leasing and investment sales of office properties. properties. Since that time, he has become an industry’s leader in medical and office real estate.

Download full bio/Download vCard

Mike McWilliams, Jr.

Associate, Brokerage Services


Mike McWilliams, Jr. is Associate of Brokerage Services with the Plaza Companies. He has spent more than 3 years in the commercial real estate industry in Arizona.

Download full bio/Download vCard

Property Management

Ernie Jackson, RPA/FMA

Director of Property & Facilities Services


As Plaza Companies’ Director of Property & Facilities Services, Ernie Jackson oversees the company’s efforts with regard to third-party real estate and building services operations while serving as a hands-on senior property manager for new portfolios.

Download full bio/Download vCard

Jeanette M.C. Socaciu, CPM, RPA, FMA

Senior Portfolio Manager/Senior Policy Advisor


Jeanette is responsible for managing a portfolio of medical and office buildings in the Phoenix metropolitan area, as well as business park & office condominium associations. She brings to the company her expertise in tenant relations, lease administration, budgeting, accounting, vendor services and association board

Download full bio/Download vCard

Melissa Annis, CPM

Senior Portfolio Manager


Melissa Annis is a dedicated Property Manager with 32 years of experience in retail and office properties. Her superior customer service and management skills serve her well in earning and maintaining the trust of clients and colleagues alike. Melissa’s extensive background in property real estate and intuitive strategic thought process as the foundation for every project she takes on.

Download full bio/Download vCard

Construction Management

Susan Byram, LEED AP

Vice President of Design and Construction


Susan Byram joined the Plaza Companies team in 2011, and brings to the table more than a decade of project management and construction experience. Her many responsibilities with the with the firm include, but are not limited to, managing commercial developments and tenant improvements, preparing Requests for Proposals, drafting and administering consulting agreements and AIA construction contracts, participating in onsite client meetings, working with municipalities to
expedite reviews and streamline the permitting process, maintaining budget, cost control and schedule for each project, and initiating and maintaining dry utility design and installation for all projects.

Download full bio/Download vCard

Business Development

Tom Evans

Lumen Strategies


Tom Evans oversees a full spectrum of communications, marketing, public relations, public affairs and business development services.