CCIM INSTITUTE - Key Persons


Barbara M. Crane

Job Titles:
  • Clements Realty Advisor

Bill Moss

Job Titles:
  • SVN - Toomey Property Advisor
  • CCIM / Southpace Properties, Inc.

Charlie Mack - Treasurer

Job Titles:
  • Treasurer
Treasurer Charlie Mack, CCIM, president of Mack Realty in Las Vegas, has been an active volunteer leader with CCIM Institute since he earned his designation in 1990. Over the past three decades, Mack has served on virtually every committee at the global level, chairing many of them, as well as numerous task forces and work groups. In addition, he has served at the chapter level as president of the Southern Nevada CCIM Chapter in 1991 and 1996. Mack also serves his community and the commercial real estate industry. He is past president of the Las Vegas Southwest Rotary Club, has served on the Clark County Comprehensive Plan Steering Committee, and was a member of the Nevada Real Estate Commission for six years, serving as its president from 2004 through 2005.

D'Etta Casto - VP

Job Titles:
  • First Vice President

David Schnitzer

Job Titles:
  • President - Elect
David Schnitzer, CCIM, LEED AP, partner at ASCEND Commercial Real Estate in Dallas, has spent the last 19 years in commercial brokerage and ownership, specializing in retail real estate, land, and investment properties. Schnitzer is also active on the asset ownership side, with retail and industrial properties making up his real estate portfolio. He has been a long-standing member of CCIM Institute and, for over a decade, served on a wide variety of institute committees in many capacities, touching every aspect of the CCIM Institute. In addition, Schnitzer was president of the North Texas CCIM Chapter in 2012 and 2013. He served as president of CCIM Technologies in 2015 and CCIM Institute presidential liaison in 2017, 2018, and 2020. Schnitzer is also a board member for the North Texas Commercial Association of REALTORS® and is a licensed Broker in Texas and Oklahoma.

Laurens Nicholson

Job Titles:
  • SVN - Toomey Property Advisor
  • CCIM / Windsor / Aughtry Company

Leslie G. Callahan III - President

Job Titles:
  • President
Leslie G. Callahan, III, CCIM, president of First Colony Financial Corporation in Atlanta, serves as 2022 president for CCIM Institute. After earning his CCIM designation in 1982, he worked extensively with the CCIM Georgia Chapter serving as its president and subsequently on a variety of institute committees, including as the treasurer and chairman of the Finance Committee. Currently, Callahan serves on the institute's board of directors and Executive Committee.

Mark Cypert

Job Titles:
  • Clements Realty Advisor

Mark Polon

Job Titles:
  • Polon Consulting

Nicholas Leider


Stephanie R. Coleman

Job Titles:
  • Clements Realty Advisor

William C. Overman, III

Job Titles:
  • SVN - Toomey Property Advisor
  • CCIM