Executive Bios

At Keystone Mortgage Corporation, our executive team has carefully recruited, trained, and retained top industry talent. Our professionals possess an exceptional level of industry experience, a sterling track record of success, and an unmatched devotion to meeting client’s needs.  The Keystone team is extremely qualified to provide the highest level of service and expertise in the commercial real estate industry.

Christopher E. Turner - CRE, President, (310) 765-7843

Keystone Mortgage Corporation Partner and President Christopher Tuner has been a leading force of Keystone for over five decades. Turner has successfully completed hundreds of transactions throughout the region, and has been influential in establishing Keytone’s sterling reputation of world-class results. As a trusted expert in the industry, Turner has taught numerous collegiate real estate courses at some of the highest-ranking universities in California. Outside of his successful tenure at Keystone, Chris is an active member of the American Society of Real Estate Counselors, the Royal Institution of Chartered Surveyors, and Lambda Alpha International. He received his MBA degree from University of California, Los Angeles.

Ron N. Buchanan - Executive Vice President, (310) 765-7840

Ron Buchanan is one of the highest producing loan professionals in Southern California. He has been a true titan in the industry – and Keystone – for over 40 years, and Buchanan’s name frequently appears on top producing lists for Genworth, Assurant, and Kansas City Life. His expert industry knowledge keeps him at the front of the market, and makes him a trusted advisor to Southern California’s prominent real estate investors. Prior to launching his successful career at Keystone, Ron facilitated construction loans at Security Pacific National for several years. Ron has membership in a variety of organizations, such as American Industrial Real Estate Association and Lamda Alpha International. He holds a BA degree in Business from California State University, Northridge.

John G. Sullivan - CMB, Senior Vice President, (310) 765-7855

Since 1984, John Sullivan has played an integral role in establishing Keystone’s first-rate industry standing, and helps the company set the bar for success in Southern California commercial real estate.  Sullivan is well-known in the industry for delivering award-winning results with professionalism, loyalty, and expertise. To provide the best industry knowledge to his clients, Sullivan remains very active in numerous industry organizations, such as the American Industrial Real Estate Association, Southern California Mortgage Bankers Association, and Apartment Association of Greater Los Angeles. John holds a Commercial Certified Mortgage Banker distinction from the Mortgage Bankers Associate, as well as a BA degree in Business Economics from the University of California, Santa Barbara.

Nick Viscount - Senior Vice President, (949) 540-9950

Nick Viscount is an industry-recognized leader, and has received numerous ‘Top Producer’ awards throughout his 17-year tenure.  He is distinguished among his colleagues for his bottom-line results, excellent client service, and lasting relationships with his investor clients that have put their trust in him. He has earned a tremendously loyal following of clients and a vast network of professional relationships that continue to benefit Keystone. Viscount has closed approximately $2 billion in commercial real estate loans throughout his career. Viscount is an active member in the Commercial Real Estate Development Association, and remains involved in his local community through coaching his children’s sports teams. Nick obtained a Bachelor’s degree in Business Economics from the University of California, Santa Barbara.

Tim M. Winton - Senior Vice President, (949) 540-9953

Tim Winton is one of Orange County’s top producers in commercial real estate. He has been a driving force in the industry for nearly 16 years, and his breadth of industry knowledge and expertise on currents market trend make him a natural broker-of-choice for his discerning clients.  He has produced hundreds of successful transaction in his tenure, and is well-known for his market-beating results. Winton previously held leadership positions at GMAC Commercial Mortgage, Capmark Finance, and Berkadia Commercial Mortgage. Winton remains active in various industry organizations, such as the NAIOP and ICSC. Tim holds a Bachelor’s degree in Environmental Economics with a Real Estate Finance emphasis from University of California, Berkeley.

James J. Ruiz - MBA,Vice President, (949) 540-9951

James Ruiz began his successful commercial real estate career more than a decade ago, and has since produced a market-leader track record of success. Ruiz is recognized for his amazing client-services, which has led to an impressive roster of repeat and referral clients. He has successfully facilitated numerous transactions throughout Southern California, and makes the process seamless for his valued clients. Ruiz has previously held positions at GE Commercial Real Estate, Buchanan Street Partners, and Wells Fargo. Outside of his accomplished career, Ruiz is a board member of Kids Konnected, a nonprofit that provides services to children with cancerous family members. He holds an MBA in Finance from Pepperdine University, and is currently pursuing a Certified Commercial Investment Member designation.


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