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Author

Rohan Gupta

Co-founder & CEO, Diopter

Rohan Gupta is the co-founder and CEO of Diopter, which detects deepfake video, cloned voices and AI-driven social engineering on live calls. He previously founded QuillBot and led it through a $200M exit to Course Hero, now Learneo, in 2021. QuillBot today serves more than 35 million monthly users.

Where the content comes from
Built from direct engagement with security and fraud practitioners, not secondary sources.
How we write
Every article describes how an attack or detection actually works. No hype, no filler.
Who this is for
Security leads, fraud investigators, and IT decision-makers who need clear, usable signal.

From building generative AI to defending against it

Rohan founded QuillBot in 2017 after posting an early version of the tool on Reddit. It became one of the most widely used AI writing platforms and was acquired by Course Hero, now Learneo, in August 2021.

He co-founded Diopter with Jeremy Pippin after seeing how quickly generative AI moved from productivity use cases to impersonation and fraud. Diopter scores live video and voice calls for synthetic media, and for the pattern attackers actually run: authority, urgency, isolation, escalation, and the ask.

Fraud is rarely detectable from a single frame or voice sample. It unfolds across a conversation, and the arc is the unit of analysis.

Diopter’s stated position on detection, from the company’s founding principles.

Track record

Present

Co-founder and CEO, Diopter

AI social-engineering and deepfake detection for live video and voice calls. Detection runs on the endpoint, so only verdicts and scores leave the device.

2017 to 2021

Founder and CEO, QuillBot

Built an AI writing platform that today serves more than 35 million monthly users. Raised a $4.25M seed from GSV Ventures and Sierra Ventures, and led the company through a $200M exit to Course Hero, now Learneo, in August 2021.

Recognition and press

Forbes · 2022

30 Under 30, Education

Recognised in the 2022 Education class for QuillBot.

Forbes · 2021

The Next 1000, Enterprise Technology

Recognised for building QuillBot into a widely used AI writing platform.

Ness Labs · 2023

Tools for Thought interview

On integrating every step of the writing process, and how AI can support language learners.

AsiaTechDaily · 2020

How he raised $4.25M to make writing painless

On the seed round, and on building a decision-making process rather than following best practices.

At a glance

RoleCo-founder & CEO, Diopter
PreviouslyFounder & CEO, QuillBot
Exit$200M, 2021
RecognitionForbes 30 Under 30, Next 1000
EducationBS Finance, MS CS, UIUC
Based inChicago, Illinois

Focus areas

Deepfake video detectionVoice cloning and vishingAI social engineeringExecutive impersonationWire and payment fraudSynthetic candidate fraudApplied generative AI at scale

Contact

For press, research questions or corrections, reach Rohan on LinkedIn or via Diopter.

Articles reviewed

Diopter research checked for technical accuracy before publication.

Threat IntelligenceHelp Desk Scam: Types, Examples & Prevention Tips20 Aug 2026Wire FraudInvoice Fraud: Types, Examples & Detection Guide13 Aug 2026Wire FraudVendor Fraud: Meaning, Examples & Prevention12 Aug 2026Deepfake DetectionHow to Evaluate Deepfake Detection Tools: A Buyer’s Checklist7 Aug 2026Business Email CompromiseHow to Prevent BEC Attacks6 Aug 2026Threat IntelligenceAgentic AI Fraud: The New Attack Surface Nobody’s Talking About Yet4 Aug 2026Deepfake DetectionDeepfake Job Interviews: Inside the Rise of AI-Generated Fake Candidates3 Aug 2026Social Engineering6 Detection Methods That Catch AI Social Engineering Attacks27 Jul 2026Deepfake DetectionWhat Is Deepfake Audio? 10 Detection Methods That Actually Work20 Jul 2026Deepfake DetectionAI Fraud Detection: How It Works for Financial Services15 Jul 2026Social EngineeringCaller ID Spoofing: How Fraudsters Impersonate Banks14 Jul 2026Executive ProtectionExecutive Cybersecurity Protection Strategies for the Modern Enterprise10 Jul 2026Wire FraudReal Estate Wire Fraud: How Closing Scams Work3 Jul 2026Business Email CompromiseBusiness Email Compromise (BEC): Complete Guide30 Jun 2026Deepfake DetectionTop Strategies to Enhance Enterprise Deepfake Prevention30 Jun 2026Wire FraudWhat is Wire Fraud — How It Works & Prevention25 Jun 2026Threat IntelligenceFamous Deepfake Scams: The 2024 Arup Cyber Attack22 Jun 2026Deepfake DetectionDeepfake Detection Methods16 Jun 2026Social EngineeringWhat is social engineering2 Jun 2026Deepfake DetectionWhat is a deepfake27 May 2026
Published articles

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What we cover
Deepfake and Synthetic Media
How face swaps, voice clones, and video forgeries are produced, and where detection is actually possible.
Voice and Video Fraud
Real-time impersonation over calls and video, from first contact through to financial escalation.
Social Engineering Arcs
The sequence attackers use to move targets through a decision chain: authority, urgency, isolation, ask.
Defender Playbooks
Detection frameworks, verification workflows, and policy controls mapped to real enterprise threat scenarios.
Live-Call Detection
How AI detection works during a call in real time, including how verdicts are generated and surfaced.
Real Incidents and Case Analysis
Documented attacks broken down by stage, method, and the points where they could have been stopped.
How we work
01
We start with practitioners
Our research is grounded in direct conversation with the security and fraud teams who are managing these threats right now, not pulled from press releases or vendor reports.
02
We describe mechanisms, not opinions
Every article is structured around how something works: the attack sequence, the detection surface, the decision point. We let the structure carry the weight, not the adjectives.
03
We review against our own detection research
Before anything publishes, it gets checked against Diopter’s internal research to make sure the technical framing holds up.
Our solutions
Diopter Solutions
AI-powered defense against synthetic fraud
▶ Executive Impersonation Defense ▶ Voice Deepfake Detection ▶ Identity & Payment Verification ▶ Help Desk Defense
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Free tool
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