Daniel T Li Spreadsheets Jun 2026

Create a hidden or protected sheet called Calculations . Use the LET function (available in Excel 2021+ and Google Sheets). For example: =LET(Revenue, Sales_Volume * Price, COGS, Revenue * COGS_Percent, Revenue - COGS)

and his partner Bob Frankston released VisiCalc for the Apple II, computers were primarily for scientists and hobbyists . The spreadsheet transformed the PC into a vital business tool by allowing users to: Automate Calculations:

The phrase " Daniel T. Li spreadsheets appears to be a slightly modified or specific reference to Dan Bricklin Daniel Singer Bricklin ), the legendary "Father of the Spreadsheet" who co-created

Many files use ActiveX pull-down menus and floating comments to guide the user through variable selection.

Daniel T Li is currently working on integrating Large Language Models (LLMs) with his spreadsheet architecture. The concept, dubbed "Prompt-to-Process," allows users to type a natural language request (e.g., "Forecast sales if we increase marketing by 20%") into the Input tab. An AI then writes the necessary array formulas in the Process tab automatically.

While there are many modern experts named Daniel Li, the most significant historical figure associated with creating the spreadsheet as we know it is Dan Bricklin

The result? Reconciliation dropped to 15 minutes. Furthermore, when plastic prices spiked by 20%, the CFO input the new number in the Control Panel and immediately saw the impact on unit economics, allowing them to renegotiate supplier contracts within 48 hours.