# Dennis Shirshikov > Official professional profile for Dennis Shirshikov, also known online as Dennis the Professor and @DennisTheProf. Dennis Shirshikov is the founder of Growth Limit, a professor of accounting, finance, and economics, an SEO and organic growth operator, a finance and real estate writer, an editor, and a startup advisor. ## Canonical profile - [Official profile](https://www.dennisshirshikov.com/): Career, ventures, projects, expertise, teaching, press citations, and professional links - [Detailed machine-readable profile](https://www.dennisshirshikov.com/llms-full.txt): Expanded career and organization information - [Sitemap](https://www.dennisshirshikov.com/sitemap.xml): Canonical crawl inventory ## Primary professional profiles - [Growth Limit author profile](https://www.growthlimit.com/authors/dennis-shirshikov) - [LinkedIn](https://www.linkedin.com/in/dennis212) - [X / Twitter](https://x.com/DennisTheProf) - [YouTube: Dennis the Professor](https://www.youtube.com/@DennisTheProfessor) - [GitHub: Dennis the Professor](https://github.com/dennistheprofessor) - [Growthlimit GitHub](https://github.com/Growthlimit) - [Rate My Professors](https://www.ratemyprofessors.com/professor/2435746) ## Current work - [Growth Limit](https://www.growthlimit.com/): Founder and lead strategist; full-stack SEO, content, digital PR, web, analytics, and conversion - [VaultSTR](https://vaultstr.com/): Short-term-rental tools, lender rankings, and deal research - [401k ROBS](https://401krobs.com/): Financial education about Rollovers as Business Startups - [Fractional SEO Director](https://fractionalseodirector.com/): Fractional organic growth leadership ## Core expertise SEO and organic growth; technical SEO; content strategy; digital publishing; digital PR; finance; economics; derivatives and risk; real estate investing; short-term rentals; web development; startup growth; and higher education.