I won the Microsoft Excel World Championship. Here's what every office worker should know about Excel.

Diarmuid Early won the 2025 Microsoft Excel World Championship. He has some Excel pointers for today's office workers.

Diarmuid Ealry

• Diarmuid Early won first place in the 2025 Microsoft Excel World Championship.
• He told Business Insider his Excel advice for everyday office workers.
• Early runs an Excel advising firm. He refined his spreadsheet skills at BCG and Deutsche Bank.

This as-told-to essay is based on a conversation with Diarmuid Early, the 40-year-old...