Top-21 Cybersecurity Experts You Must Follow on Twitter in 2021

Top-21 Cybersecurity Experts You Must Follow on Twitter in 2021
Share article
twitter linkedin medium facebook
There is nothing better than learning from the experts when it comes to Cybersecurity. Gaining insights from the industry’s top influencers can prove to be crucial in optimizing your Application Security strategy. Without further adieu, we are glad to share a list of Top-21 Cybersecurity experts you must follow on Twitter in 2021. It’s time to demystify threats like Magecart, Web-Skimming, Supply Chain Attacks and more.
Rafay Baloch
#1 Rafay Baloch

Rafay Baloch’s Twitter Account

Rafay Baloch is a famous InfoSec expert who is widely known for his ethical hacking. He is the go-to expert when it comes to identifying large security threats such as zero-day vulnerabilities and WAF flaws. Being a popular author and public speaker, Baloch has his own blog where he exposes vulnerabilities in mobile and web browsers and gives helpful security-related tips. 


Claim to Fame – Author of the “Ethical Hacking and Penetration Testing Guide” and AppSec articles on Forbes, Yahoo News, and more. Listed in the “Top 25 threat seekers of 2014” and “The 15 Most Successful Ethical Hackers WorldWide”.

Troy Hunt
#2 Troy Hunt

Troy Hunt’s Twitter Account

Troy Hunt is a renowned author and contributor to the Pluralsight courses on web security. He is a frequent speaker at tech conferences that cover cybersecurity topics. Mostly known for his website called Haveibeenpwned?, he helps millions of businesses and private web users to identify whether their emails or phones have been tampered with or their data was stolen. 


Claim to Fame – Troy Hunt is a Microsoft Most Valuable Professional for Developer Security.  In 2018, he received the Grand Prix Prize for the Best Overall Security Blog, which is followed by thousands of readers from around the world.

Kevin Mitnick
#3 Kevin Mitnick

Kevin Mitnick’s Twitter Account

After having been arrested and sentenced for hacking 40 large organizations, Mitnick became a white hat hacker who helps big corporations and even governments. He is a frequent guest at broadcasts like CNN, FOX News, and BBC, where he educates or comments about security issues. Being a part-owner of KnowBe4, he creates training programs to spread security awareness. 


Claim to Fame – Kevin Mitnick is an author of several books, including “Art of Intrusion: The Real Story Behind the Exploits of Hackers, Intruders and Deceivers” and” Art of Deception: Controlling the Human Element of Security”.

Rachel Tobac
#4 Rachel Tobac

Rachel Tobac’s Twitter Account

white hat hacker is the CEO of Social Proof Security – a cybersecurity company with an impressive client list that includes PayPal, Twitter, Uber, WhatsApp, and others. The way her company educates people about security is by holding Social Engineering events, where attendees can autonomously hack a website. The receivers of the attack are fully aware of the situation of course. 


Claim to Fame – Rachel Tobac’s company, Social Proof Security, has taken second place in the social engineering competitions at DEFCON for three consecutive years, an impressive feat in itself. 

Mikko Hyppönen
#5 Mikko Hyppönen

Mikko Hyppönen’s Twitter Account

Mikko Hyppönen is a Finnish security expert who became famous after inventing the so-called Hyppönen Law, a IoT rule that describes that any “smart appliance” is vulnerable. He has been working at F-Secure since 1991 and his impressive articles have been published in the New York Times and Wired. Hyppönen also lectures at the universities of Stanford, Oxford, and Cambridge. 


Claim to Fame – Mikko Hyppönen has been awarded the Cybersecurity Person of the Year in 2020 by CISO MAG. He has over 200 thousand devoted followers on Twitter, which is quite impressive too.

Katie Moussouris
#6 Katie Moussouris

Katie Moussouris’s Twitter Account

Moussouris is a security expert who is famous for propagating responsible security research and vulnerability disclosure. She took part in creating a bug bounty program for the US Department of Defense that incentivizes individuals to report security-threatening bugs in exchange for compensation and recognition. Katie Moussouris is also the founder of Luta Security. 


Claim to Fame – Forbes called Katie Moussouris one of the “America’s Top 50 Women In Tech”, a true female pioneer in the Cybersecurity space She also received the “Women of Influence” award in 2011. 

Bruce Schneier
#7 Bruce Schneier

Bruce Schneier’s Twitter Account

Bruce Schneier is a famous security technologist and Lecturer at the Harvard Kennedy School. He has written and published numerous Application Security books and also has his own blog that covers security-related trends. Bruce Schneier is also a member of EFF (Electronic Frontier Foundation) and has played a major role in the creation of several cryptographic algorithms.


Claim to Fame – Bruce Schneier is the author of many books, including the most famous “Beyond Fear: Thinking Sensibly About Security in an Uncertain World” and “Liars and Outliers: Enabling the Trust that Society Needs to Thrive”. 

Brian Krebs
#8 Brian Krebs

Brian Krebs’s Twitter Account

Despite not having formal training, Krebs has become one of the most globally recognized Cybersecurity experts. He has been an investigative journalist at The Washington Post where he covered computer security topics and interviewed hackers. Nowadays, Brian Krebs has his own blog called KrebsOnSecurity where he exposes data breaches across companies. 


Claim to Fame – Brian Krebs is an author of an award-winning book called “Spam Nation: The Inside Story of Organized Cybercrime – from Global Epidemic to Your Front Door”. A true self-made professional and influencer. 

Jeremiah Grossman
#9 Jeremiah Grossman

Jeremiah Grossman’s Twitter Account

Jeremiah Grossman is a worldwide recognized expert of Cybersecurity, as well as the founder of WhiteHat Security. He holds lectures and workshops at tech events like DefCon, ISACA, ISSA, and others as well as frequently contributes to discussions about cybercrime in the Washington Post, NBC Nightly News, and USA Today. An impressive professional who lives and breathes Cybersecurity.


Claim to Fame – Jeremiah Grossman has published a book called “XSS Attacks: Cross Site Scripting Exploits and Defense”. A real InfoSec expert who is making a difference in the way companies plan and implement their AppSec strategy.

Eugene Kaspersky
#10 Eugene Kaspersky

Eugene Kaspersky’s Twitter Account

Eugene Kaspersky is a Russian cybersecurity expert who has earned worldwide fame with his company Kaspersky Lab. His organization has roughly 4,000 employees and his anti-virus products have attracted more than 400 million users. Having co-founded the Kaspersky Lab in 1997, he still remains the CEO of the company and appears on the Forbes list with a $1.2 billion net worth.


Claim to Fame – Among other achievements, Kaspersky was awarded the “World’s Most Powerful Security Executive” award and was acclaimed the “Top Global Thinker” for forwarding the IT security field. 

Dan Lohemann
#11 Dan Lohrmann

Dan Lohrmann’s Twitter Account

Lohrmann is a well-known blogger, speaker, and contributor to mentorship programs where he creates training courses, workshops, and seminars to educate professionals about Cybersecurity. He is also a leading consultant who helps representatives of the White House, US Department of Homeland Security, and Fortune 500 organizations to improve their security standards.


Claim to Fame – Dan Lohrmann is an author of books called “Virtual Integrity: Faithfully Navigating the Brave New Web” and “BYOD for You: The Guide to Bring Your Own Device to Work”.

Steve Morgan
#12 Steve Morgan

Steve Morgan’s Twitter Account

Morgan is an established journalist and researcher of cybersecurity topics. Every year, he prepares a report about the current state of cybercrime, including statistical data. His reports are being referred to and quoted by a variety of magazines, journals, and other media outlets. His mission is to share the information he knows and give his perspective about cybersecurity issues. 


Claim to Fame – Steve Morgan has published a book called “WOMEN KNOW CYBER: 100 Fascinating Females Fighting Cybercrime.” He is also the executive producer of Cybercrime Radio. 

Tyler Cohen Wood
#13 Tyler Cohen Wood

Tyler Cohen Wood’s Twitter Account

Having worked in cybersecurity for over 20 years, Wood has become an important influencer. She has worked for the Defense Intelligence Agency, White House, Federal Law Enforcement, where she has developed cybersecurity policies that made the governmental security programs more efficient. Tyler is also a frequent guest on television, podcasts, radio, etc. 


Claim to Fame – Onalytica’s 2020 report named Tyler Cohen Wood one of the keynote speakers. Cybercrime Magazine called her one of the top 20 IT security experts, who is now an expert  on a global level.

Graham Cluley
#14 Graham Cluley

Graham Cluley’s Twitter Account

Graham Cluley is a security expert who is famous for writing the first version of Dr Solomon’s Antivirus toolkit. Nowadays, he has his own blog that he has named after himself where he shares the latest news and trends about cybersecurity. Graham Cluley is a frequent keynote speaker at cybersecurity events like Microsoft Future Decoded, Web Summit, ISSA, and many others. 


Claim to Fame – Graham Cluley has his own weekly podcast called Smashing Security. He has been named the “User of the Year” by Twitter, a smashing feat that alone deserves a follow from you.

Theresa Payton
#15 Theresa Payton

Theresa Payton’s Twitter Account

Theresa Payton is an industry-leading security expert and the CEO of Fortalice Solutions that handles cyber defense, cybercrime, and provides education. She has also co-founded Dark Cubed – a cybersecurity firm. Theresa participates at technical conferences as a speaker and lecturer as well as shares her knowledge on social media and in magazines. 


Claim to Fame – Teresa Payton is the author of “Privacy in the Age of Big Data​: Recognizing Threats, Defending Your Rights, and Protecting Your Family”. She has also appeared on the list of the top 25 Most Influential People in Security.

Shira Rubinoff
#16 Shira Rubinoff

Shira Rubinoff’s Twitter account

Shira Rubinoff is an IT security expert who has founded two cybersecurity companies. She offers consulting services to Fortune 100 organizations about the topics of security as well as business development. Shira is a respected publisher and author of numerous articles and lectures on the subject. She is also President of the New York-based technology incubator. 


Claim to Fame – Shira Rubinoff is the author of the book called “Cyber Minds: Insights on cybersecurity”. CaberHub Summit named her the “Outstanding Woman in Infosec”.

Eva Galperin
#17 Eva Galperin

Eva Galperin’s Twitter Account

Galperin works for the EFF as the Director of Cybersecurity. She is an advocate for transparency when it comes to cybersecurity issues and encourages Apple and Android phone producers to alert their users upon detecting stalkerware on their devices. Eva’s work is dedicated to creating policies that provide privacy and security to everyone, especially vulnerable people. 


Claim to Fame – Eva Galperin’s proactivity gave her the title “Most Creative People of 2019” by the Fast Company Magazine. She currently has almost 150K followers on Twitter, a true Cybersecurity success story.

Marcus J. Carey
#18 Marcus J. Carey

Marcus J. Carey’s Twitter Account

Marcus J. Carey is a widely known expert on cybersecurity. He is a senior Enterprise Architect at ReliaQuest, where he creates solutions to enhance cybersecurity across industries and countries. His main focus lies on cybersecurity solutions that are based in the cloud to provide more efficiency, accessibility, and better performance. 


Claim to Fame – Marcus J. Corey is mostly famous for his book series called “Tribe of Hackers”. Besides being an InfoSec expert and influencer, he is also a true artist who likes to think outside the box.

Jayson E Street
#19 Jayson E Street

Jayson E Street’s Twitter Account

Jayson E Street is the VP of Information Security at InfoSec, where he plans and creates seminars and workshops about cybersecurity. He also has his own website called Dissecting the Hack that is fully dedicated to teaching people about cybersecurity and sharing the latest developments in the field. A true teacher with thousands of InfoSec professionals flocking to his channels. 


Claim to Fame – In 2006, Jayson E Street was recognized as the person of the year by Time Magazine, something that made him an icon. He is also an official @defcongroups and @HackNotCrime Ambassador.

Paul Asadoorian
#20 Paul Asadoorian

Paul Asadoorian’s Twitter Account

Paul Asadoorian is mostly known to a broad audience as the founder of the Security Weekly podcast that covers topics of cybersecurity and hacking. He is also a large contributor to the Tenable where he prepares materials about security vulnerabilities. Paul is a frequent guest at technical events like RSA, Derbycon, SOURCE Conference, and many others.


Claim to Fame – Asadoorian’s podcast Security Weekly has received the award for the Best Security Podcast in 2015. COVID-19 did a lot of damage in 2020, but Asadoorian has only expanded his digital reach in recent months.  

Adam K. Levin
#21 Adam K. Levin

Adam K. Levin’s Twitter Account

Adam K. Levin is a security advocate and the founder of CyberScout – a company that offers identity management for businesses in case of data breaches. He is a beloved speaker at numerous conferences where he talks about cybersecurity, personal finance management, issues of credit, etc. Adam is concerned with protecting data in the world of growing IoT and cyber fraud. 


Claim to Fame – Adam K. Levin’s best-selling book called Swiped was positively met by CEOs, Amazon, Publishers Weekly, and The Sunday Times. He has dedicated himself to fighting scammers and identity thieves.


We highly recommend you go ahead and follow these Cybersecurity experts to learn more about the latest threats and risks that can harm your business. You are also invited to follow the official Reflectiz Medium Channel for all third-party application security related insights and expert analysis of top Cybersecurity incidents. Stay safe!

Subscribe to our newsletter

Stay updated with the latest news, articles, and insights from Reflectiz.

Your Website looks great!

But what’s happening behind the scenes?

Discover your website blind spots and vulnerabilities before it’s too late!

Try for free