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Marco Neumann is responsible for the content on crepererum.net. The website is not a commercial offering as it does not sell any products or services, does not contain any ads, and does not participate in any affiliate programs. Marco Neumann lives in Hamburg, Germany. He writes about topics such as skin cancer screening, visualizing election results, IoT security, ransomware prevention, and Linux on desktop.

Rachel is the creator of Rachel's Ruminations, a travel blog focused on independent travel with an emphasis on historical sites/sights. She also reviews hotels, resorts, cruises, and tours, and has published articles about life as an expatriate. Rachel also has a newer website about travel to UNESCO World Heritage sites. She lives in Groningen, in the northeast of the Netherlands, with her husband, Albert. Rachel is Dutch, but grew up in Connecticut in the US, so English is her first language. After a long career as a teacher and teacher-trainer, she has retired early to focus on her websites and on travel.

Kelly Sutton is a software engineer living in Seattle. He is the CTO and co-founder of Scholarly Software. Previously, he was on the engineering team at Gusto. He has started and sold Designer News, HackCollege, and LayerVault. He was also known at one time for the Cult of Less.

Ghastly, also known as ghastlymirror, is an amateur nature photographer, blogger, horror movie fan, and gamer. Ghastly's introduction to gaming began with 90s edutainment and racing games like Grand Prix 2. Ghastly enjoys exploring old games, especially those they were unable to play during childhood. When not exploring virtual worlds, Ghastly enjoys nature hikes and bird watching. Favorite genres include life simulation, RPGs, racing, and point and click adventure games. Ghastly uses Canon 500D, Xiaomi 10T Lite, and Canon R (Mirrorless) camera models. Ghastly started a blog in 2022 to get into long form blogging.

Tago So is a data developer with a passion for automation, integration, and visualization. Tago has experience as a Technical SEO Specialist at Gambling.com Group in Helsinki from 2020 to 2025, where they built automated dashboards and data pipelines using tools like Python and Google Apps Script. Prior to that, Tago worked as a Marketing Analyst at Monetrack in Bangkok and as a Sales Consultant (Data-driven) at CM DATABANK in Tokyo. Tago enjoys coding and has projects on GitHub and Observable NB.

Wargaluk is ill at ease and not their usual self. They are Polish, male, and 37 years old. They work as a freelance book designer and typesetter. Wargaluk has a master’s degree in philosophy and dropped out of two other university programs, as well as a PhD program in philosophy. They are decidedly introverted and solitary but have deep and strong bonds with the few people who are important to them. Wargaluk lives a simple life on the margins, away from the main currents, and doesn’t pursue excitement, variety, luxury, or prestige. They are sensitive to beauty in nature and art and appreciate the aesthetic dimension of life.

Steve Schoger is a visual designer from Canada. He is known for sharing design tips on Twitter and refactoring UIs on YouTube. Steve recently published a book and video course called Refactoring UI with Adam Wathan, which teaches about designing for the web. He is not currently taking on new client work.

Adam Wathan is a full-stack developer and entrepreneur. He shares his knowledge about making software through his articles, talks, screencasts, podcast, and courses. In 2016, he released his first book and left his job to make things full-time that help other developers build better software. Currently, he is working on Tailwind CSS and shares updates about his progress in his work journal. He is also known as Justin's worst nightmare.

Christian is an IT professional and open source enthusiast with a fondness for cryptography and security. He runs various servers. His PGP key fingerprint is 2340 F683 A6F2 2D39 215F 6C19 917A 4842 9BFE 2CB4. He can be contacted via email at christian@thackston.dev or through Sourcehut at cmt. His PGP key can be downloaded from his website, and the fingerprint can be verified in his Sourcehut bio and email signature. He welcomes questions and conversation.

Levelsi is a socio-cultural theorist and experiential design thinker. Describing themself as an ‘artist of psychology,’ their work explores the intersections of money, technology, art, and the human condition. They maintain a critical stance towards technological advancement and its societal impact. Levelsi aims to put their “whimsical lines of understanding” at the service of quality, beauty, resilience and fullness of life. They write and engage in conversations to confront paradigms with alternative worldviews. Levelsi studies living spaces and is willing to liberate mind-body practices from dogma and tradition. Emphasizing the role of play in navigating ambiguity, they keep away from competitive games. They can be contacted via email at “have” at “some” dot “lc,” or found on Bluesky Social.

Alexander Klippel is described as a "vänster- och högerhjärnetänkare," which translates to a left- and right-brain thinker, an "internetnörd" (internet nerd), and a father. He shares personal notes about his weight loss journey and tips for managing Gmail. He posts about music he enjoys and writes reviews, including one for the TV series "Patriot" and another about "Julmust." He shares information about his Firefox extensions, and mentions joining a podcast. He also shares tips for brewing "dunderglögg" and building a cooling coil for home brewing.

Tomás Gutiérrez is from Chile and studied Computer Science at Universidad de Santiago de Chile (USACH). He enjoys learning new tools and technologies and tries to keep up to date. He created a blog to document new things he has learned and things he has done related to computer systems, programming, or tools. He hopes his experience can help others. He can be contacted through email at tomas (at) 0x00 (dot) cl.

Yann nominally does software and has done so since the late 1990s. He is good at embedded systems, Rust, C, C++, distributed systems, and infrastructure. He has worked at various places including Twitter, Lyft, and Airbnb. He is an expert in Observability and Reliability systems. He likes doing hardware projects, software projects, fish (reef and fresh water), pictures (of things), and space (and pictures of space), and the intersection of all of those.

Trevor I. Lasn is a builder and founder, as well as a product engineer based in Tartu, Estonia. He has been coding and building products for over a decade and continues to learn every day.

Jyn is a software engineer who enjoys building things with code. She is passionate about learning new technologies and using them to solve problems. She is currently working as a Software Engineer at Cloudflare. Previously, she was a Software Engineering Intern at Facebook. She graduated from the University of Waterloo with a Bachelor's degree in Computer Engineering.

Mathias Bynens works on Chrome at Google. He is a web standards enthusiast from Dendermonde, Belgium. His interests include HTML, CSS, JavaScript, Unicode, performance, and security. He codes websites using HTML, CSS, JavaScript, QMS, Web Guidelines of the Belgian Government, Web Guidelines Quality Model of the Dutch Government, and AnySurfer Accessibility Guidelines.

MHTN Lab was started on June 5th, 2024, as a creative outlet for study and to maintain accountability. The creator shares what they learn on their journey. They consider this their way of giving back. They were inspired by Dennis Devey of Roppers. They can be contacted via session. Donations to support their mission are accepted and will go toward making educational resources and cyber awareness.

Gerben Jacobs is a 37-year-old software engineer from Ede, Netherlands. He lives there with his wife and two children. He enjoys hiking, music, games (both video and board games), history, and technology. He has a Dutch blog and an English-based site at gerben.dev.

kaumnen is a platform engineer, currently working primarily with AWS. They are proficient in Python and Go. kaumnen holds SAA-C03 and AZ-104 certifications. They have projects on GitHub, with cipr being a highlighted project, and documentation available at cipr.kaumnen.com. kaumnen can be found on X (formerly Twitter) at @kaumnen. They also have a homelab.

Daniel Huang is a developer who created cotton, a package manager for JavaScript projects. Cotton's installation process is noted for its speed. Daniel Huang also developed an optimization mod for Minecraft, improving performance from 15 fps to 70 fps. He achieved 48th place on a global leaderboard in 2023 and 86th place in 2022.