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Christian Berthelsen

Stay informed with Christian Berthelsen’s coverage and analysis.

Federal prosecutors fearing ‘witness intimidation’ illegally searched Rudy Giuliani’s Apple iCloud account, lawyers say
Politics
Federal prosecutors fearing ‘witness intimidation’ illegally searched Rudy Giuliani’s Apple iCloud account, lawyers say
By Christian Berthelsen, Greg Farrell and BloombergMay 17, 2021
Reddit ringleader ‘Roaring Kitty’ sued for securities fraud over GameStop trading frenzy
Finance
Reddit ringleader ‘Roaring Kitty’ sued for securities fraud over GameStop trading frenzy
By Christian Berthelsen and BloombergFebruary 18, 2021
Deutsche Bank eagerly took on clients dumped by JP Morgan Chase. Now it’s facing big fines
Finance
Deutsche Bank eagerly took on clients dumped by JP Morgan Chase. Now it’s facing big fines
By Christian Berthelsen and BloombergJuly 9, 2020
Giuliani Ally Got $1 Million From Ukraine Oligarch’s Lawyer
Politics
Giuliani Ally Got $1 Million From Ukraine Oligarch’s Lawyer
By Christian Berthelsen and BloombergDecember 18, 2019
Family Trust Sues Giuliani Ally and Trump-Connected PAC to Recover $500,000
Politics
Family Trust Sues Giuliani Ally and Trump-Connected PAC to Recover $500,000
By Christian Berthelsen and BloombergNovember 19, 2019
Rudy Giuliani-Lev Parnas-Trump
Politics
Giuliani Ukraine Allies Lev Parnas and Igor Fruman Arrested in Campaign Finance Scheme
By Christian Berthelsen, Andrew Harris and BloombergOctober 10, 2019
JPMorgan Chase & Co.
Tech
Russian Hacker Will Plead Guilty for Role in JPMorgan Cyber-Attack
By Christian Berthelsen and BloombergSeptember 16, 2019
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Success
Mark Cuban says he has the solution to growing income inequality, and it's to reward every employee—from CEO to janitor—with company stockplaceholder alt text
By Sasha RogelbergJuly 20, 2026
Cybersecurity
OpenAI says its AI models secretly broke out of a secure test environment and hacked into AI company Hugging Face in order to cheat on an evaluationplaceholder alt text
By Jeremy Kahn and Emily ForliniJuly 21, 2026
AI
Mathematicians grapple with a ‘very rapid and very unsettling change’ as AI cracks yet another century-old problemplaceholder alt text
By Eva RoytburgJuly 21, 2026
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