About Bill Hartzer, Digital Marketing Expert Witness

Background and Career

Bill Hartzer has worked in digital marketing since the late 1990s, beginning his career at a multinational software company where he managed search engine optimization, online advertising, and web analytics across multiple languages and international markets. That early experience provided a foundation in the technical, analytical, and strategic aspects of digital marketing that has guided his work ever since.

Over the following decades, Bill held leadership roles in digital marketing agencies and built a consulting practice serving clients ranging from startups and small businesses to Fortune 500 companies. His work has spanned the full spectrum of digital marketing disciplines, including search engine optimization, paid search advertising, social media marketing, display and programmatic advertising, content marketing, email marketing, affiliate programs, and marketing analytics.

Digital Marketing Expertise

Search Engine Optimization (SEO)

Bill has spent more than two decades working in SEO, with deep expertise in technical SEO, website migrations, crawl optimization, indexation, structured data, Core Web Vitals, and the analysis of algorithm updates. He continues to manage active SEO campaigns, which keeps his knowledge current and grounded in real-world search engine behavior.

Paid Search and Digital Advertising

Bill has extensive experience with Google Ads, Microsoft Advertising, and other paid media platforms. His work includes campaign architecture, bid strategy, conversion tracking, Quality Score optimization, landing page analysis, and ROI measurement. He understands both the strategic and technical layers of paid search management.

Social Media Marketing

Bill's experience extends to social media advertising and organic social strategy across platforms including Meta (Facebook and Instagram), LinkedIn, YouTube, and X (formerly Twitter). He has managed social campaigns for brand awareness, lead generation, and direct response, and understands how social media performance data is measured and reported.

Analytics, Attribution, and Measurement

A recurring theme in Bill's career has been the measurement and analysis of digital marketing performance. He has deep experience with Google Analytics (both Universal Analytics and GA4), Adobe Analytics, call tracking systems, CRM integrations, and multi-touch attribution models. His understanding of how data flows through marketing technology stacks is particularly valuable in cases where analytics accuracy or attribution logic is in dispute.

Content Marketing and Email Marketing

Bill has worked with content marketing strategies including editorial planning, content optimization for search, and content distribution across owned, earned, and paid channels. His experience also includes email marketing platforms, list management, deliverability, and campaign performance analysis.

Expert Witness Experience

Bill Hartzer has served as an expert witness in legal matters involving digital marketing disputes, providing independent analysis and testimony for both plaintiffs and defendants. His expert witness work has included the following.

• Authoring detailed expert reports analyzing digital marketing evidence, campaign performance, and technical failures
• Preparing rebuttal reports responding to opinions offered by opposing digital marketing experts
• Analyzing historical traffic patterns, advertising spend, and search visibility to quantify damages
• Evaluating whether SEO and digital marketing practices met industry standards of care
• Assessing click fraud, invalid traffic, and ad misplacement in paid advertising campaigns
• Reviewing analytics implementations and attribution models for accuracy and reliability
• Explaining algorithm updates, platform policy changes, and their effects on marketing performance
• Providing deposition and trial testimony that translates technical digital marketing concepts into language that judges and juries can understand

Approach to Expert Witness Work

Bill's expert opinions are built on data, not speculation. Every analysis begins with a thorough review of the available evidence, followed by a structured methodology that opposing counsel can examine and test. His goal is to help the court understand what actually happened in the digital marketing channels at issue and how those events affected the business or individual involved.

Because Bill continues to manage active digital marketing campaigns across multiple channels, his expert opinions reflect current platform behavior, industry standards, and best practices. His analysis is grounded in what he sees daily in real campaigns, not in outdated textbook knowledge.

Hartzer Consulting

Bill is the founder of Hartzer Consulting, a digital marketing consultancy based in the Dallas-Fort Worth area. Through Hartzer Consulting, he advises organizations on search engine optimization, paid advertising, analytics, and digital strategy. He also founded DNAccess, which provides domain name consulting, acquisition, and security services.

Industry Involvement

Throughout his career, Bill has been active in the digital marketing community. He has presented at industry conferences on topics including technical SEO, search analytics, domain names, and the intersection of digital marketing and legal disputes. He has also published extensively on these topics, contributing articles and analysis that reflect his hands-on experience and technical depth.

Working with Legal Teams

Bill understands the requirements of litigation support, including the importance of confidentiality, adherence to deadlines, independence of analysis, and the preparation of opinions that meet applicable evidentiary standards. He is experienced in working with legal teams on both sides of a dispute and is available for expert reports, rebuttal reports, depositions, trial testimony, and consulting engagements.