Agent Bios

Full Time Property Managers and Realtors

Dana Brown

Dana, Assistant Broker, obtained his Real Estate Brokers License in 1997 in the State of Arizona. After moving to Arizona in 1989, he began property management of large Apartment complexes and managed over 500 apartment units. Dana has 20 years of active property management experience in Arizona and is successful in assisting investors get the most profit out of their investment properties! Dana has earned his Certified Property Manager Designation and is also a graduate of the Graduate Realtor Institute.

Mike Konieczki

Mike, Designated Broker, has 15 years of Real Estate and Property Management experience in Arizona. He works with both Sellers and Buyers. Mike also handles many rental properties and was voted Property Manager of the year in 2012.

Sharon Martinez

Sharon Martinez is our full time Bookkeeper and accounting guru. Sharon is responsible for keeping track of all accounting for the investment properties Cornerstone manages, and making sure owners get their rent checks each month. Sharon deals directly with the tenants and owners with regard to rent collections, vendor payments and move in / move out expenses.

Allison Nguyen

Allison joined the Cornerstone team in 2015 and works as a property manager as well as in home sales and with buyers. She graduated from Arizona State University in 2009 with a degree in Secondary Education Spanish (¡Habla Español!) and has a Master’s Degree in Education from University of Cincinnati. She taught high school Spanish before getting her license in 2015.


Mindy Brown

Andrew Kinch

Qamar Zaman

Joe Vignali


We offer full service Residential Real Estate Services & Property Management services for the Phoenix Metro Area.

WE provide expert real estate services in:

Phoenix, Peoria, Glendale, Surprise, Scottsdale, Avondale, Litchfield Park
and most other Phoenix Metro Cities