Past experience includes working in various capacities in architectural positions, including drafting and design of residential, commercial, and industrial projects.

Engineering experience includes, research and development for Naval Ocean Systems Command (NOSC), Naval Electronics Laboratory, and Pacific Bell, with work on advanced under sea search vehicle and field communications systems for Marine Corps. As a Quality Assurance Engineer, developed and designed quality manufacturing procedures for heart valves.

Teaching experience includes blueprint reading, geometry, trigonometry, mathematics and other subjects for Southwestern College and Rohr Industries.

Construction experience over the past 50 years includes building design, construction project management, estimating, supervision, and "hands on" experience in all construction disciplines including carpentry, roofing, plumbing, electrical, landscaping, and interior and exterior finish work.

Employed by California Building & Consulting, Inc. (CBC) for approximately 15 years, culminating in the position of principal and officer. In addition to the usual duties as a principal in a construction company, was also responsible for all estimating as the Estimating Manager.

CBC was a General Contractor in the State of California and Arizona specializing in the reconstruction of condominium and multi-family projects and consulting support. In 1997, CBC completed reconstruction totals exceeding 22,000 units repaired, 2,500 Cost of Repair Estimates, and over 4,000 Destructive Tests. Work emphasis was on reconstruction project management, preparation of bids, and Cost To Repair estimates. Projects typically ranged in value from $200,000 to $30,000,000, with the highest being $280,000,000.

D.L. Waller & Associates, (dba Waller + Opsal Consulting) founded in 1978 was incorporated November of 1997, and specializes in construction consulting, estimating, and expert testimony.

Experienced as a consultant / expert witness for attorneys, homeowners associations, architects, engineers, developers, and insurance companies, in both plaintiff and defense capacities. Our case venue ranges from southern San Diego County to the Bay Area, and Arizona and Nevada.

Have testified in court and arbitrations approximately two dozen times, and have been deposed as an expert on several hundred occasions. Have served as an Independent Third Party Expert and Confidential Independent Estimator.

Served as discipline expert in the development of Contractor's State License Board examination.

Papers Authored

Article, "Does Construction Experience Make You a Better Estimator?" published in SD Mator Newsletter (ASPE), January 2002 and The Estimator (ASPE), July 2002.

Letter, "Framing Repair," Fine Homebuilding, November 2001.

Article, "In Our Quest for an Answer, Do We Lose Sight of the Question?" (Ethics and Fairness), published in S.D. Mater Newsletter (ASPE), March 2001.

Article, "Cost of Repair Accuracy, Bid or Estimate, "published in S.D. Mator Newsletter (ASPE), May 1999 and Society News (ASPE), September, 1999.

Letter, "Improvements for Foundation Detailing," Fine Homebuilding, November 1998.

Response, "The Role of Cost Estimator is Debated," Los Angeles Daily Journal, August 1998.

Technical paper, "How to Estimate the Cost of Deck Membrane Waterproofing – Dampproofing," prepared for American Society of Professional Estimators, June 1995.

Article, "Shake Roof Care Tips Offered," The Community Associations Institute (CAI) Newsletter, May 1989.

"How to Avoid Construction Defect Litigation", 5 sessions by Gray, Cary Ames & Frye, 1988.

"Anatomy of a Construction Defect Lawsuit", Speaker and Panel Member, June 1989.

"Construction Defects & Solutions", CAI, November 1991.

"Dispute Resolution Alternatives Supercourse", Practicing Law Institute, 1993.

"Dispute Resolution Innovations In the Construction Industry", American Arbitration, December, 1993.

"Fourth Annual Construction Defect Seminar", West Coast Casualty, October 1996.

"Fifth Annual Construction Defect Seminar", West Coast Casualty, October 1997.

"Sixth Annual Construction Defect Seminar", West Coast Casualty, May 1999.

"Joint Cost Management Societies Symposium", American Society of Professional Estimators, October 1998.

"Joint Cost Management Societies Symposium", American Society of Professional Estimators, November 1999.

"NCSBCS / NIST / HUD Joint Technical and Research Conference", November 1998.

"Geotechnical and Environmental Liability", Ninyo & Moore, March 1999.

"Ethics and Fairness", ASPE In-House Speaker, March 2001.

"Does Construction Experience Make You a Better Estimator?", ASPE In-House Speaker, January 2002.

"Litigation and Claims Estimating Seminar for Attorneys", American Society of Professional Estimators, February 2002, Speaker and Panel Member.

"Above Grade Clear Water Repellant Treatments", AIA, February 2002.

"Below Grade Waterproofing", AIA, February 2002.

"Keys to Quality EIFS Systems", AIA February 2002.

"Low Slope Commercial Roofing Systems", AIA, February 2002.

"Mold: Environmental and Geotechnical Considerations", Ninyo & Moore, April 2002.

Presentation to American Society of Professional Estimators of "Ethics in Litigation Estimating", May 2002.

"Mold Remediation in Buildings", Environmental Testing and Technology, Inc., August 2002.