Principal

Mr. Serenyi joined Colliers International in 1998, and has played an active role in numerous industrial, and investment transactions earning him the title of the Colliers Rookie of The Year. Since joining Colliers International, Steve’s aggressive approach to marketing properties and representing clients has brought him numerous accolades and designations such as CoStar’s Annual List of Power Brokers and the Denver Business Journal’s Heavy Hitters List of Top 20 Commercial Real Estate Brokers. In 2006, Mr. Serenyi was promoted to Vice President of the Industrial Division of Colliers International, and in 2007 was made Partner.  When Steve isn’t working he’s chasing, wrestling, and being humbled by his 1, 3, 6, and 7 year old children.

Senior Vice President - Brokerage

Harrison Kane joins Colliers Houston as a Senior Vice President. He represents his clients on both the acquisition and sale sides of transactions.  He focuses on land tracts (urban or suburban) for single family, multifamily, retail and industrial development. He oversees all aspects of the transaction process for his clients.  Harrison works with and represents landowners throughout the greater Houston area and helps them create a competitive bidding situation in order to maximize the value and shorten the timeline of each transaction. He also works on investment sales in the transitioning submarkets of Houston where there is great redevelopment potential.  Harrison is a sixth-generation Houstonian who graduated from Episcopal High School. He then went on to the University of Georgia where he graduated with a Bachelor of Business Administration in Marketing. Harrison holds his Real Estate Broker’s License in the State of Texas. Prior to Colliers, he worked for McAlister Real Estate and Rockspring Properties focusing on land transactions.

Executive Vice President

Joseph Hill heads the Investment Advisory Team at Colliers St. Louis, offering a wide range of commercial real estate services tailored to client needs. With extensive expertise in valuation, appraisal, leasing, and investment sales, Joe and his team use a strategic, full-cycle advisory model to help clients optimize their real estate investments.  Joe works with a broad spectrum of clients—from individual property owners and financial institutions to major REITs and Fortune 100 companies. He has successfully managed projects across all property types and built a strong national network. As Colliers St. Louis’ consistent top performer, Joe has earned repeated recognition in the Everest Club, an honor awarded to the top 10% of professionals in brokerage, valuation, and corporate solutions across the U.S. based on revenue.  Before joining Colliers, Joe was a Director at Gateway Commercial, a Cushman & Wakefield affiliate in St. Louis. Earlier in his career, he specialized in occupier services at Block Hawley Commercial Real Estate, brokerage at Coldwell Banker Commercial, and appraisal and valuation with R.A. Buckles and Associates. His broad background across different sectors of the industry equips him to deliver in-depth expertise and high-level service.  Outside of work, Joe is a former nationally ranked road cyclist and currently volunteers with Big Brothers Big Sisters of Eastern Missouri.

Executive Broker

Jim Irwin is an Executive Broker at Colliers | Arkansas, where he focuses on investment brokerage and development, representing corporate, institutional, and individual investors throughout central and northwest Arkansas. His expertise spans acquisitions, dispositions, advisory services, restructuring, development, and leasing, with transaction experience in Arkansas, Mississippi, and Louisiana. A 1973 graduate of the University of Arkansas with a BSBA in finance, Jim began his career as a commercial real estate appraiser in Little Rock, earning the prestigious MAI designation in 1980. That same year, he transitioned into brokerage and later founded his own commercial real estate firm in 1990. He led Irwin Partners, a firm specializing in brokerage, development, and investment, alongside the property management company Irwin Saviers Ballard, before merging both entities into Colliers | Arkansas in late 2017.

Vice President

Drawing on her background in corporate leadership, Sohaila Willis has developed extensive expertise in commercial real estate sales, acquisitions, and leasing, specializing in investment properties such as hotels, car washes, and gas stations. Her bilingual fluency broadens her client reach and provides a distinct competitive edge. With more than 13 years of experience in commercial real estate brokerage and a career total exceeding $200 million in leasing and sales transactions, Willis consistently ranks among the top-performing brokers at Colliers Nashville. She now co-leads the firm’s newly established hospitality team, dedicated to delivering hospitality-focused services throughout Tennessee, Kentucky, and Alabama.

Zack Ficke is Vice President of the Institutional Capital Markets Group at Colliers International, where he specializes in acquisitions, dispositions, and capitalization strategies for CTL, NNN, and federally leased properties across the U.S. His primary expertise lies in representing developers and sellers of single-tenant, investment-grade assets, with significant experience in portfolio transactions and sale-leaseback deals. He works with a wide range of clients including public REITs, developers, private equity firms, syndicators, and international investors, while also supporting his eight-person team in operations and management, which has closed $1.2 billion in transactions across 44 states. Before joining Colliers, he worked with Marcus & Millichap’s Office/Industrial and NNN property groups in Dallas. Earlier in his career, he served as Vice President of Strategic Partnerships for major media companies including Cumulus Media/Westwood One and iHeartRadio/Premiere Networks, where he drove business development and secured more than $250 million in sponsorship revenue with Fortune 500 brands. With over 17 years of corporate management and sales experience, Ficke brings a consultative approach to commercial real estate, assisting owners with lease negotiations, property valuation, dispositions, acquisitions, and equity capital formation for new developments.

Executive Vice President - Retail Services Group

David A. Grant serves as an Executive Vice President in the Retail Services Group at Colliers International Las Vegas, focusing on the sales and leasing of retail properties. Before joining Colliers, he held leadership roles as Vice President of Leasing at Triple Five Nevada Development Corporation and Vice President of Retail Properties, as well as Corporate Broker, for American Nevada Corporation. With experience spanning all aspects of shopping center development, design, sales, and leasing, Mr. Grant has been active in the real estate industry since 1985. He is widely recognized for his dedication to his clients and the local real estate community, having built strong professional relationships throughout his career.

Senior Vice President

Before joining Colliers International | Central California in 2014, Zack spent three years as a commercial property manager overseeing about 3 million square feet of office, industrial, and retail space in Sacramento and Fresno. He now focuses on retail sales and leasing, investment transactions, tenant representation, and development projects.

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