Who we are

Robert Bitterli, AIA/NCARB,LEED AP

Principal Consultant, Director

Throughout his career he has provided clients with a personal commitment, delivering expert consultant services in a forthright manner, with both pragmatic and theoretical perspectives in mind.

  • Trial and Mediation Expert Witness
  • Forensic Architecture
  • Design & Construction Claims

Mitchell Wright, AAFS, RWC, IACT

Principal, General Manager
Building Scientist

Mr. Wright has been engaged in the field of Building Science and Forensic Architecture for the past 10 years, specializing in Building Envelope Science, Research and Analysis.

  • Scientific and Industry Standards
  • Waterproofing and Roof Inspections
  • Material Properties and Performance

Scott Bitterli, CDT, LEED GA

Project Manager, Building Investigator

Scott Bitterli is a Project Manager & Building Investigator; conducting tests, gathering evidence and coordinating teams on-site. He ensures that we effectively communicate with engaging reports, presentations and infographics.

  • Data Management & Visualization
  • Graphics and Document Management
  • Sustainable Technologies & LEED

Steven D Lange, RA, REALTOR®

Senior Consultant, Architect

Steve has been a registered architect in the State of Florida since 1978 and brings to the firm a wide range of architectural experience in all aspects of project development.

  • Architectural Standards of Care
  • Forensic Document Analysis
  • Architectural/Construction Defects

Jack Townley, RA, GC (Retired)

Senior Consultant

Mr. Townley has close to 40 years of  experience as an Architect and Contractor, 18 Years Property and Casualty Insurance and a strong background in Condominium Development and Conversion.

  • Architect & General Contractor
  • Remediation & Project Management
  • National & International Experience

John H. West, III

Building Claims Investigator

Mr. West serves as Building Claims Investigator and Licensed Florida Insurance Adjuster. His career has been focused in Engineering Design and Construction Observation.


  • On-Site Inspections
  • Building Claims
  • Property Insurance

Leila Bitterli, MBA

Business Manager

Ms. Bitterli brings her Master of Business Administration degree and 8+ years of experience in insurance, financial planning and marketing to her role handling Ivy Group Consultants’  Roanoke office and company-wide human resources, finance, and accounting processes. 

  • Insurance & Vendor Contracts
  • Employee Benefits
  • Marketing & Editing

Debbie Knippen

Office Manager, Client Relations

Ms. Knippen works closely with our team and our clients to ensure prompt and friendly Contract Management & Project Administration. She also handles Interior Design and Artistic Renderings.

  • Client Relations
  • Account Management
  • Office Management

David W Griffiths

Roofing, Waterproofing & Coatings Specialist

With 14 years of experience as a general contractor & commercial coatings professional, Dave handles design consultation, building envelope specifications and water intrusion investigations.

  • Waterproofing
  • Paints and Sealants
  • Roofing Systems

David M. Harper, FAIA, LEED AP


 Throughout his career, Mr. Harper has specialized in the design of higher education projects, K-12 schools, aviation projects, and institutional and military buildings.

  • Business Development
  • Master Planning
  • Institutional Architecture

Stewart Aiken, AIA, LEED AP


Mr. Aiken is a noted expert in on-campus student housing projects for many of the major colleges and universities, and has significant experience with multi-family housing projects.

  • Student Resident Housing
  • Multi Family Housing
  • General Practice

Richard Aiken, AIA


Since beginning his specialization in U.S. Department of Housing and Urban Development Modernization in 1974, Mr. Aiken has completed projects resulting in more than 100,000 units of affordable housing.

  • Affordable Housing Developments
  • Sustainable Building
  • Architectural Finance