Assessor's Leadership Staff
Tim Boncoskey, Chief Deputy Assessor
Tim Boncoskey serves Assessor, Paul D. Petersen as the appointed leader for a professional staff of 310 with an annual operating budget in excess of $24 million and a new $25 million CAMA Project. The office annually notices and administers over 1.7 million real and personal property parcels/accounts with full cash value of more than $475 billion in 2017.
Tim joined Maricopa County Assessor Keith E. Russell's administration in July 2006 after 17 years with the State of Arizona. He also worked as a senior budget analyst for the Fairfax County Office of Management and Budget in Virginia before beginning his Arizona State government career.
Mr. Boncoskey began his state service working for the Governor's Office of Strategic Planning and Budgeting where he analyzed various agency budgets including the Department of Revenue for fiscal year 1991 and 1992. He served as an initial management staff member in the Governor's Office for Excellence in Government from 1993 to 1995, becoming Executive Director in 1994. He was appointed in January of 1995 as Assistant Director for the Management Services Division in the Department of Administration (ADOA) and held various executive management positions in ADOA until he joined Maricopa County. Tim served three Governors in his seven years as the Chairperson on the Governor's Regulatory Review Council from 1996 to 2003.
He received his Bachelors Degree in Public Administration in 1983 from the University of Arizona and his Masters Degree in Public Affairs in 1985 from the LBJ School at the University of Texas and attended the Governor's Center at Duke University Strategic Leadership Program for State Executives in 1999.
Since engaging in the assessment field, Tim was elected President of the Arizona Chapter of the International Association of Assessing Officers (IAAO) for 2007-2008 and 2011. He was also selected as a national chapter representative in 2009. Tim was appointed by the IAAO President in 2011 to serve as Chairman of the Major Jurisdictions Council and Local Host Committee for the 2011 Conference and Chairman of the Councils and Sections Committee of IAAO in 2012.
He was selected IAAO Member of the Year in 2012 and was enshrined in Maricopa County's Pillars of Honor in 2013 for that achievement. Tim was elected by the IAAO membership as an Executive Board member out of Region 1 (Western North America and the Pacific Rim) for 2013 - 2015. In 2014, Tim, along with four other IAAO Board members, was tasked with developing the 2020 Vision and Strategic Plan for IAAO (2015 - 2020).
In 2016, Boncoskey was recognized with the IAAO Stacy Ford Award for most outstanding Representative and the Kenneth J. McCarren Award for recruiting the most new IAAO members. In November of 2016, Tim was elected by the IAAO membership as their Vice President for 2017.
Tim was appointed by the Arizona Department of Revenue Director to the State of Arizona education, training and certification advisory committee for statewide assessor certification programs where he was appointed Chairman in April of 2015.
Tim lives in Phoenix and has three children.
Tracy Johnston, Chief Appraiser
Fax: 602-506-6846 or 602-372-3788
Tracy Johnston, MAI, AAS, is a long-time professional real estate appraiser, consultant, expert witness, and business owner. She graduated from the University of Tampa in 1982 with a degree in Economics and received the MAI designation from the Appraisal Institute in 1994. Tracy recently earned the AAS designation from the International Association of Assessing Officers.
Born and raised in Tampa, Florida, Tracy and her family relocated to Phoenix in 2010, where she first joined the Assessor's Office in the Litigation division. After a two-year stretch as the Chief Appraiser in the Maricopa County Real Estate Division, Tracy returned to the Assessor's Office in 2015 as Chief Litigation Appraiser and is currently the Acting Commercial Manager of the Appraisal Division with a staff of 45.
In addition to real estate valuation and consulting, Tracy has enjoyed working in the public sector and opportunities to lead teams of appraisal professionals in achieving a variety of successful results.
Tracy is an avid sports fan and outdoors-woman and lives in South Phoenix with her husband, mom and three dogs.
Thomas Rief, Appraisal Manager
Thomas Rief, has over 21 years of experience in both the public and private sectors of real estate, land use and development. Tom has owned his own small business, been a partner in a land development company, consulted in a national law firm, and managed a critical unit for the City of Scottsdale.
Tom has a strong devotion to public service and a desire to be a bridge between the community and government. Tom holds a BS in Architectural Planning and Urban Design from ASU, is a member of the American Planning Association (APA) and International Association of Assessing Officers (IAAO).
Tom and his wife Terry are parents to two active girls, Amanda and Alyssa. They live in Scottsdale.
Ray Bell, Appraisal Manager
Fax: 602-506-6846 or 602-372-3788
Ray Bell joined the Maricopa County Assessor's Office in April 2007 as a commercial appraiser. His commercial development background and financial analysis skills provided quick advancement to the Litigation Division in January 2010. During that tenure Ray provided expert Risk Management analysis and settlement negotiations for the most complex commercial properties for the benefit of county taxpayers at large.
Ray has a nearly 40 year real estate background and has held an Arizona Real Estate Broker's license for more than 35 years. His financial, construction and development background includes approximately 2 million square feet of commercial office, industrial and retail space and additionally includes nearly 2,000 apartment and condominium units as well as master planned community land developments.
He received his Bachelor of Arts Degree in English Literature, Minor in Russian History in 1970 from The University of Arizona. He was a Master's of Arts Candidate in Acting, Directing and Film Making before launching an entrepreneurial career with restaurants in Denver and Aspen, Colorado in 1972.
Ray is a member of the International Association of Assessing Officers (IAAO) and the Urban Land Institute (ULI). He was also selected to the United States Croquet Association Hall of Fame in 2000.
Ray is a third generation Arizona Native and lives in Phoenix with his wife Alene. They have two children, Lauren and Paul and a wonderful daughter-in-law Jenny.
David Hansen, Appraisal Manager
David Hansen has over thirteen years of experience with the Assessor's Office. He has a background in commercial construction as a project manager for a small construction company where he learned about both construction and the life of a small business. David began as a residential appraiser with the Office and worked his way through commercial appraisal to become the Major Properties Supervisor for six years before being promoted to Appraisal Division Manager.
David is a member of the state and international chapters of the International Association of Assessing Officers (IAAO) through which he earned both Assessment Administration Specialist (AAS) and Residential Evaluation Specialist (RES) designations.
He is married and enjoys time with his wife, pets, and a good book.
Uwe Hohoff, Chief Modeler – CAMA
Fax: 602-506-6846 or 602-372-3788
Uwe Hohoff began his technical appraisal career with the Saskatchewan Assessment Management Agency in 1996. In 2000, Uwe was hired as a Regression Modeler with the Maricopa County Assessor's CAMA Division and was promptly promoted to Sr. Regression Modeler and worked his way up to Chief Modeler of this division.
Uwe's extensive training, knowledge and experience in Computer Assisted Mass Appraisal is a great support to the Maricopa County Assessor's high-tech CAMA Division.
Uwe and his family reside in Maricopa County.
Lesley Kratz, Executive Advisor/Special Districts
Lesley Kratz is a key member of the Assessor's leadership team. She started with the Assessor's office in 1990 as a programmer/analyst and was responsible for creating business requirements to develop a new computer application. She has been instrumental in the development of the award winning Maricopa County Assessor's webpage. She also directed the establishment of a new permitting system that allows all 26 jurisdictions within the county to transmit their building permits electronically. Currently, Lesley provides special reports and reviews to the Assessor and provides information to all levels of government, as well as the business community, regarding tax rates and net assessed valuations.
Lesley earned her Bachelor of Science degree in 1987 from Purdue University in West Lafayette, Indiana. She is an avid Colts and Boilermaker fan and enjoys golfing in her spare time.
Eric Bails, Chief Technology Officer
Eric Bails serves as Chief Technology Officer for the Assessor. Eric has over 20 years' experience in developing data management strategies and information technology strategies for the public sector and private businesses in the United States and Europe. His career has included positions in noted global consultancies, and he has provided Delivery Assurance services for a successful major business application implementation for the State of Arizona. Eric's professional interests include Information Architecture, Business Process Architecture, Application Selection, IT / Business Alignment, and the execution of transformational projects.
Eric was graduated from the University of California at Berkeley with a double major in Political Science and Economics. In his spare time he officiates adult and youth club soccer, and he is a seasoned high-altitude hiker who has bagged peaks in New Zealand, Scotland, Africa, and his native California. He resides in Tempe and has one son.
Robert Pizorno, Valuation Relief Program (VRP) Manger
Robert Pizorno joined Maricopa County Assessor Paul D. Petersen's Administration in September 2013 as the Director of Communications and Government Relations. In August, 2015, he accepted the promotion to become the manager of the Valuation Relief Programs (VPR) section. Prior to joining the Assessor's office, Robert was Chief of Staff for Phoenix City Councilman Sal DiCiccio. He also has a successful private law practice.
Robert is originally from Nevada but upon his graduation from the University of Nevada, Robert took a position with Sen. John McCain's office, moving to Arizona in 1996. He worked for Senator McCain at his local government office and later went on to serve as his Deputy Finance Director for his 1998 re-election campaign. In December of 1998, Robert took the Chief of Staff position for County Supervisor Fulton Brock, the incoming Chairman of the Board of Supervisors.
After three years with Supervisor Brock, Robert left his position at Maricopa County to attend law school at Arizona State University. In 2004, Robert graduated law school with his Juris Doctorate and took a position with a local law firm, practicing in the area of land use, zoning and development law.
In 2009, he went into private practice, expanding his areas of practice and continues that practice currently.
He lives in Phoenix and has four amazing children ‐ 3 girls and boy. He is an avid photographer, runs marathons and, most importantly, loves to spend time with his kids helping them pursue their dreams.
Shelly Bunn, IT Senior Manager
Shelly Bunn joined the Assessor's Office in August, 2017. She manages IT Operations for the Office. Shelly previously served as Deputy Chief of the Maricopa County Sheriff's Office (MCSO) Technology Bureau for 18 years. Prior to her position at MCSO, Shelly was employed by the Maricopa County Office of the Chief Information Officer and the County Manager's Office. She holds a Bachelor's degree in Finance from Boise State University and a Master's in Public Administration from Arizona State University.
Allen Zingg ‐ Manager, HR/Training
Allen Zingg joined the Maricopa County Assessor's Office as Human Resources manager in June 2006. Allen achieved a Bachelor's degree in Psychology and holds a Master's degree in Industrial Relations from Rutgers University in New Jersey. His experience in both, not-for-profit and, for-profit organizations, as well as in his own creativity business, gives Allen a wealth of human resources, organizational knowledge and insights to help the Assessor's Office continue to grow and improve.
Allen and his wife moved to Phoenix, from New Jersey, shortly before joining us.
VACANT, Manager ‐ Ownership/Mapping Division