W. H. Heyden & Associates is a full-service real estate appraisal and consulting firm that was started by William Heyden in August of 1993.  As of 2017, the company consists of William Heyden, Kent Gastreich, Carrie Gilker, Ryan Mudd, & Erica Pagano.  You can find more information about each associate below.
William H. Heyden

Mr. Heyden has been active in the real estate appraisal profession since 1983. His appraisal experience has been in all types of commercial properties including apartment complexes, warehouses, low and high rise office buildings, shopping centers (free standing, neighborhood, and regional). manufacturing buildings, savings and loans, hospitals, nursing homes, sports arenas, and vacant land. Appraisals prepared by Mr. Heyden have been used for such purposes as sale or purchase, allocation of purchase price, loan collateral, foreclosure, sale-leaseback, rental value, and leasehold interest.


Mr. Heyden formed W. H. Heyden & Associates, a full-service real estate appraisal and consulting firm in August 1993. The firm specializes in commercial as well as residential real estate valuations, and related consulting assignments.
Mr. Heyden was formerly a partner with Ochs-Heyden & Associates from July, 1991 to July, 1993.

From April, 1988, to July, 1991, Mr. Heyden was employed as a commercial real estate appraiser for Equitable Real Estate Investment Management, Inc. Appraisal experience included a wide range of properties such as regional malls, bulk and office warehouses, strip retail centers, suburban and CBD office buildings, and apartments, utilizing various discounted cash flow software programs including Project+.

From April, 1983, to April 1988, Mr. Heyden was employed as a commercial real estate appraiser with the R J Wilson Company, an Omaha, Nebraska based fee appraisal firm. Appraisal experience included virtually all types of income producing properties.


Mr. Heyden is a Missouri State Certified General Real Estate Appraiser No #001041, Kansas State Certified General Real Estate Appraiser No. 1860, Illinois State Certified General Real Estate Appraiser No. 153001411, and Iowa State Certified General Real Estate Appraiser No. CG0205.

Mr. Heyden was previously a member of the Admissions Committee for the St. Louis chapter of the Appraisal Institute. Also, he has been a member of the Regional Ethics Committee of the Appraisal Institute.


Mr. Heyden attended Nebraska University at Omaha, receiving his Bachelor of Science degree in Business Administration with specializations in Real Estate and Business Management. He was awarded the top undergraduate of the real estate college in the spring semester of 1981. He has also taken several courses offered by the American Institute of Real Estate Appraisers toward a professional designation. These include Real Estate Appraisal Principles, Basic Valuation, Capitalization Theory and Technique I & II, Case Studies in Real Estate Valuation Analysis. Awarded passing grade for demonstration report: 4/18/90 - American Institute. Awarded passing grade for MAI comprehensive exam: 10/2/90 - American Institute.

Member Appraisal Institute Designation (MAI).
Carrie Gilker

Ms. Gilker has been involved in the analysis of offices and other workplace environments for over twenty years.  She has extensive experience in research techniques and data analysis.  Her appraisal experience includes a wide range of properties, from retail, office and industrial properties to apartments and mobile home parks.


Ms. Gilker has been associated with W. H. Heyden & Associates (WHH) since 2003.  Prior to joining WHH, she served as a researcher and consultant to businesses located around the world.  Her efforts were directed toward optimizing organizational functioning through maximizing the fit between employees and their work environment.


Ms. Gilker has a Master of Science degree in Interior Environments from the University of Wisconsin - Madison.  She is licensed in Missouri and Illinois as a State Certified General Real Estate Appraiser.
Ryan Mudd

Mr. Mudd has been a full-time licensed real estate appraiser since 2008.  Mr Mudd  performs accurate valuations on all types of residential and commercial real estate including multi-family, office, retail and farm land.


Mr. Mudd joined W.H. Heyden and Associates in 2015.  Prior to joining Heyden and Associates Mr. Mudd was self employed as a real estate appraiser.  Mr. Mudd first received his associate appraiser license in 1998 while he worked for Robert Elder Appraisals in Sullivan, Illinois.


Mr. Mudd received a Bachelor of Science in Business Marketing from Millikin     University.  Mr. Mudd has completed all the required courses and is currently a state certified residential appraiser.  He is continuing to complete his course and field work to obtain the state certified general appraiser designation.
Erica Pagano

Ms. Pagano's professional experience includes performing market research, appraisal and evaluation services for many types of properties, including:  light industrials, vacant land (industrial, commercial), retail centers, office buildings, houses of worship, day care centers and apartment complexes. 


Ms. Pagano has been associated with W. H. Heyden & Associates (WHHA) since 2016.  Prior to joining WHHA, she was in sales and business management for over 10 years.


Ms. Pagano graduated from University of Missouri- St. Louis in 2007 with a Bachelor of Liberal Studies, minors in Psychology and Communications.  She has completed 79 hours of appraisal courses required by the Appraisal Institute and continues to pursue her State General Certification.

W. H. Heyden & Associates
9730 E Watson Rd Ste 105
Saint Louis, MO 63126
Telephone: (314)842-3555 
FAX: (314)842-3777

[email protected]