Meet the Gemini Rosemont Team

We take pride in our management team, which is led by a group of long-tenured real estate executives with a unique and diverse set of work and life experiences to draw upon in order to bolster our nearly 30 year track record. This team has established Gemini Rosemont as a leader in the real estate investment management arena.

Gemini Rosemont employs a staff of approximately 75 professionals who work collaboratively to serve the needs of our various constituencies while continuing to build our portfolio.

Our Seasoned Leadership Team

Adrian Sum


Adrian Sum
Chairman and Chief Executive Officer

Mr. Sum is responsible for all major corporate decisions and the firm’s business strategy, with the key objective to drive business growth while building a greater presence.

Mr. Sum has an extensive experience in corporate management of listed companies, investment and financing, and financial management. In addition to his roles with Gemini Rosemont, he has a long track record with Gemini Investments, where he is currently an Executive Director and Chairman of the Board for Gemini Investments.

Mr. Sum is also currently the Chief Financial Officer of Sino-Ocean Group Holding Limited. In this role, he is primarily engaged in overall operations management of Gemini Investment and is responsible for overseas business development.

Mr. Sum is currently a fellow member of the Hong Kong Institute of Certified Public Accountants and a fellow member of the Institute of Chartered Accountants in England & Wales.

Mr. Sum has a Professional Diploma in Accounting from the Hong Kong Polytechnic University, a Master’s Degree in Business Administration from the University of Wales and a Diploma in Legal Studies from the University of Hong Kong.

Jason Kuester


Jason Kuester
Chief Operating Officer & Acting President, Central Region

Jason Kuester is Chief Operating Officer and a member of Gemini Rosemont’s Senior Leadership Team. He is responsible for all corporate related functions and provides overall support to regional operations. Additionally, Mr. Kuester is Acting President, Central Region, which is comprised of approximately six million square feet of commercial office space in 35 buildings across 13 U.S. states with an approximate value of $770 million. He is the company’s primary contact with the commercial real estate brokerage community.

Since joining the company in 2013, Mr. Kuester has led the acquisition of more than 1.7 million square feet of Class A office product valued at approximately $700 million, including Silicon Valley’s Central Tech Park, San Diego’s The ESET Building at 610 West Ash, Belmont’s 600 Clipper and Seattle-Bellevue’s One Twelfth @ Twelfth.

Prior to joining Gemini Rosemont, Mr. Kuester served as Director of Investment / Asset Management for Crescent Real Estate Equities Ltd., where he was responsible for asset level planning, including implementation of business plans to maximize the income and appreciation returns of the firm’s real estate assets. He directed acquisitions and all due diligence, underwriting and contract negotiations for office acquisitions totaling $1.1 billion and dispositions totaling $2.5 billion.

Mr. Kuester holds a Bachelor of Science degree from Baylor University and a Master of Business Administration degree from Texas Christian University.

Samuel Konigsberg


Samuel Konigsberg
Corporate Counsel

Samuel Konigsberg is corporate counsel of Gemini Rosemont and a member of the Senior Leadership Team. He is responsible for the legal work relating to all capital transactions including, but not limited to, acquisitions, sales and financing.

Mr. Konigsberg was engaged in the private practice of law in New York and New Jersey specializing in corporate, real estate and tax law prior to joining the company in 1994. Before starting his own firm, Konigsberg Sussmane & Zapfel P.C., he was a partner at the firm of Ruffa & Hanover P.C., a boutique firm specializing in private placement and public offerings for securities. Prior to commencing his legal career, Mr. Konigsberg was a tax associate with the accounting firm of Ernst & Whinney.

Mr. Konigsberg received a Bachelor of Science degree with a major in Accounting from the State University of New York at Buffalo, a J.D. from the State University of New York at Buffalo School of Law and an LLM in Taxation from New York University School of Law.

Paul Gerwin


Paul Gerwin
Executive Vice President and President, East Coast Region

Paul Gerwin holds several positions within the Company, including Executive Vice President, President of the East Coast Region, and is a member of the Senior Leadership Team. He manages the company’s New York development effort and is responsible for generating new business initiatives for the East Coast region.

Previously, he managed Gemini Rosemont’s acquisition, diligence and on-boarding of over 370 projects in 35 states, totaling more than 35 million square feet since joining the company in 1992. Additionally, he has managed the successful completion of hundreds of commercial real estate mortgages, including the refinancing of many properties, totaling several billion dollars of value.

Mr. Gerwin was Vice President and Director of McCune-Gerwin Architects in Los Angeles where he was responsible for the design and management of over 500 real estate projects, ranging from single-family residences to high- rise offices. He was also President and Director of Buena Vista Properties, a real estate construction, development and management firm.

Mr. Gerwin was a licensed architect in California and New Mexico. He earned both a Bachelor of Architecture degree and a Master of Business Administration degree from the University of Southern California.

Tenzin Tsungmey


Tenzin Tsungmey
President, West Coast Region

Tenzin Tsungmey is President of the West Coast Region, for Gemini Rosemont and is a member of the Senior Leadership Team. He is responsible for a portfolio of Class A commercial office space valued at approximately $620 million, comprised of nearly 1.2 million square feet in key tech centric markets, including Silicon Valley and San Diego, California, and Bellevue, Washington.

In his role as President of the West Coast region, Mr. Tsungmey oversees sourcing investment opportunities, asset and property management, analyzing market trends and providing recommendations to investors.

Prior to joining Gemini Rosemont, Mr. Tsungmey assisted the Chairman of Gemini Investments, a Hong Kong based affiliate of Sino-Ocean Group, in development of venture capital investments and senior living business of Sino-Ocean Group and collaboration with key stakeholders.

Mr. Tsungmey earned a Bachelor of Science degree from University of Massachusetts, Amherst, and holds a Master’s degree from City University of New York.

Anthony Kwong


Anthony Kwong
Deputy Chief Financial Officer

Anthony Kwong is Deputy Chief Financial Officer for Gemini Rosemont and is primarily responsible for oversight of the capital structure, organization assessment, risk compliance and internal control.

Mr. Kwong was an Associate Director with Gemini Investments (Holdings) Limited (Gemini Investments), a Hong Kong Stock Exchange listed real estate investment and development company, where he was focused on financial controls of the company’s U.S. investments.

Prior to joining Gemini Investments and Gemini Rosemont, Mr. Kwong served in a number of positions with Deloitte Hong Kong, most recently as Senior Manager for the audit and assurance department focusing on audit, risk control, and mergers and acquisition transactions for the real estate, retail and hospitality industries across Asia Pacific and the U.S.

Mr. Kwong received his Bachelor of Business Administration, majoring Professional Accountancy, from The Chinese University of Hong Kong. He is a Certified Public Accountant.

Michael Hernstad


Michael Hernstad
Deputy Chief Financial Officer

Michael Hernstad is Deputy Chief Financial Officer and is a member of the Senior Leadership team. He leads the company’s Financial Operations team, including managing financial strategy and structuring, reporting and accounting, portfolio analytics, taxation, and investor reporting. He is also responsible for managing and overseeing the company’s Human Resources function.

Mr. Hernstad has more than 16 years of experience in accounting and financial reporting in real estate and valuation. Prior to joining Gemini Rosemont, Mr. Hernstad was Director of Finance and Accounting at BKM Capital Partners, a real estate fund manager with $1.7 billion assets under management.

Mr. Hernstad was previously Director of Accounting at Colony Capital, where he was responsible for financial accounting, management and reporting for the firm’s funds and sponsored investments valued in excess of $5 billion before serving as Controller for Watt Investment Partners. He began his career at Deloitte in South Africa and later transferred to Los Angeles, where he was Audit Manager in the real estate practice.

Mr. Hernstad earned both a Bachelor of Accounting and Honors Bachelor of Accounting from the University of South Africa. He is a Certified Public Accountant and a Chartered Accountant.

Julia Golden


Julia Golden
Senior Vice President, Director - Capital Markets

Julia Golden is Senior Vice President and Director – Capital Markets. She serves a dual role as a member of the legal team, managing closings for Gemini Rosemont capital transactions and institutional and foreign investor structuring, and as a member of the capital markets team, managing equity, joint venture and fund investor relations, marketing, and capital restructuring.

Ms. Golden’s former responsibilities included the legal closing of dispositions, acquisitions and refinances, from drafting agreements to reviewing closing statements, directing funding coordinating with in-house and third-party counsel, and the Company’s acquisitions, asset management, accounting, and due diligence teams. Ms. Golden currently administers key elements of the company’s institutional investment program, working with investors and their representatives in structuring complex investment vehicles and overseeing the preparation of required documentation, corporate maintenance and reporting for these vehicles.

Since joining the company in 2004, Ms. Golden has closed the acquisition of more than $1 billion in commercial real estate and the structuring of more than $800 million of individual institutional equity investments.

Ms. Golden attended Southern Methodist University and the University of New Mexico.

Andy Wong


Andy Wong
Vice President - New York

Andy Wong is responsible for overseeing the administration and operations of the company’s eight-person New York regional office. He helps source development investment opportunities in the U.S., including researching and compiling market data, analyzing property trends, and making recommendations to investors. He assists in project financing, including maintaining lender relationships and evaluating terms for construction loans and refinancing.

Mr. Wong has been involved in the development team’s acquisition of residential projects in New York, which at completion will be valued at more than $400 million and comprise 280,000 gross square feet. He led the acquisition of the company’s first New York development project, an 85,000 gross square foot condominium project at 101 W. 14th Street in Manhattan. Prior to joining Gemini Rosemont,

Mr. Wong was a business consultant at a New York-based technology company that specialized in pension fund administration, where his primary client was the Metropolitan Life Insurance Company.

Mr. Wong earned a Bachelor of Science degree in Finance from The Pennsylvania State University. He is proficient in conversational Cantonese and Mandarin.

Audra Alessandrone


Audra Alessandrone
Senior Vice President - Due Diligence

Audra Alessandrone is Senior Vice President leading and managing the property due diligence efforts and project management on all corporate acquisition, disposition and financing transactions.

Ms. Alessandrone has overseen more than 300 capital transactions from inception to completion since joining the company in 1995. She has day-to-day control of
all aspects of the due diligence process including income and expense review, tenant interviews, lease audits, third-party contract audits, physical inspections, environmental review, property condition assessments and market research.

She supervises a team of analysts and associates, and manages all facets of team interaction and collaboration with Gemini Rosemont’s fully integrated group of professionals and outside consultants to create an efficient and effective workflow process.

In addition to close interaction with the acquisition, legal, asset management and finance departments, she also coordinates diligence efforts with third-party vendors and brokers. Ms. Alessandrone is also responsible for communicating due diligence findings to the investment committee while actively participating in the investment decision.

Ms. Alessandrone graduated from Eastern New Mexico University with a Bachelor of Fine Arts.