about the authors

Trey Grainger is the founder of Searchkernel, a software company and consultancy building the next generation of AI-powered search. He is also an advisor to several startups and an adjunct professor of computer science at Furman University. He previously served as CTO of Presearch, a decentralized web search engine, and as chief algorithms officer and SVP of engineering at Lucidworks, an AI-powered search company whose search technology powers hundreds of the world’s leading organizations. He is also the co-author of Solr in Action (Manning, 2014), the leading book on Apache Solr. Trey has over 17 years of experience in search and data science, including significant work developing semantic search, personalization, and recommendation systems, and building self-learning search platforms leveraging content and behavior-based reflected intelligence. This work resulted in the publication of dozens of research papers, journal articles, conference presentations, and books at the cutting edge of intelligent search systems.

Doug Turnbull is principal engineer at Reddit, former staff relevance engineer at Spotify, and former chief technical officer at OpenSource Connections. He is the co-author of the book Relevant Search (Manning, 2016), and he contributed most of chapters 10–12 of this book.