Welcome to Equity Development Systems, Ltd.

Mr Steven N. Siegler, FRICS-EWAS, ASA-ARM Dispute Resolution Panel Services in U.S. / Americas

A Super Appraisers® Elite-Rated Firm.

RICS only Expert Witness Accreditation Service Certification in the Americas.

The Internationally-Recognized Brand for Excellence in Valuation and Appraisal Expert Witness Testimony and Distressed Asset Management, Dispositions, and Private-Equity Investing.


Equity Development Systems, Ltd. Washington, DC, 22202

About Us

For over 40-years, Equity Development Systems, Ltd., (EDS) unparalleled performance, industry leadership, and global reach have helped global corporates, lenders, attorneys and law firms, operating companies, and investors throughout-the-world manage change. We bring a unique—powerful combination of industry expertise, global experience, and private capital to each opportunity.

What EDS offers is unique, and uniquely EDS—a purpose-built firm specializing in creative solutions for global corporates and the finance and legal communities. At EDS clients work exclusively with veteran professionals—industry instructors and global luminaries—whose reputation for excellence and influential insights are recognized and appreciated in boardrooms and courtrooms throughout-the-world.

As you explore our award-winning suite-of-services you will find a common core—passion and excellence in what we do—principled-exacting care in how we do it—and familial-reverence for whom we do it.

EDS is a relationship-driven firm. Our commitment to clients is nurturing, reliable, constant, and untiring. We build lasting relationships based on performance and in our ability to provide our client’s with a broad range of unique—value creating advice and services.

Working closely together, our integrated services operating groups provide unparalleled advice and service on a global basis. EDS is distinguished by its unique industry expertise and its success in forming long-term working relationships with our global clientele.

Valuation / Appraisal Specialty Services Include:
Valuation /Appraisal in all Disciplines of Valuation - Real/Personal Property and Business Valuation
Valuation / Appraisal Expert Witness Testimony and Litigation-Support
Valuation / Appraisal Rights and Arbitrage
Valuation / Appraisal Dispute Resolution Arbitration/Mediation/Umpire/Referee
Valuation / Appraisal Review/Audit/Professional & Regulatory Compliance - USPAP/IVS/Red Book/Basel III Accords/Cross Border - Multi-Jurisdictional Regulations
Valuation / Appraisal Advisory, Feasibility Studies, Risk Analysis, and Risk Management
Valuation / Appraisal Portfolio Management (Public and Private)

Services & Staff

Type of surveyor

  • Chartered Valuation Surveyor


  • Building surveying
  • Business valuation
  • Commercial property
  • Contract administration
  • Contract management
  • Dispute resolution
  • Environment
  • Expert witness
  • Facilities management
  • Quantity surveying
  • Real estate management
  • Valuation

Business type

Private Practice


  • English
  • Spanish

Partners and Directors

  • Mr S N Siegler FRICS


Expert Witness Commercial Property

  • Mr S N Siegler FRICS

Expert Witness Corporate and Personal Recovery

  • Mr S N Siegler FRICS

Expert Witness Environment

  • Mr S N Siegler FRICS

Expert Witness Plant and Machinery

  • Mr S N Siegler FRICS

Expert Witness Professional Negligence

  • Mr S N Siegler FRICS

Expert Witness Residential Valuation and Reports

  • Mr S N Siegler FRICS

Expert Witness Valuation

  • Mr S N Siegler FRICS

Expert Witness Valuation and Reports

  • Mr S N Siegler FRICS

Contact Equity Development Systems, Ltd.


Firms that are Regulated by RICS commit to the highest professional and ethical standards. In the rare cases where disciplinary action has been taken against a firm, records are published online.

If you cannot find the information you are looking for, please contact RICS Regulation at regulation@rics.org. Alternatively, if you wish to make a complaint, please contact complaints@rics.org.