The **father of Object-Oriented Programming (OOP)** is **Alan Kay**. Alan Kay is widely recognized for his pioneering work on the development of OOP concepts. He was instrumental in the creation of the programming language **Smalltalk**, which was one of the first programming languages to fully embrace OOP principles.

Kay’s vision for OOP was influenced by his work on the **Dynabook** concept, an early idea for a portable personal computer, which emphasized the need for flexible, user-centered computing systems. He saw OOP as a way to better model and represent complex systems, using "objects" to simulate real-world entities that could interact in a modular, reusable way.

While other early contributions to OOP were made by various individuals (such as Simula, a language developed by Ole-Johan Dahl and Kristen Nygaard), Alan Kay’s work in the 1970s laid the foundation for OOP as we know it today.

### Key Contributions of Alan Kay:

- **Smalltalk Language**: Smalltalk was one of the first programming languages to implement OOP fully. It introduced concepts like classes, objects, methods, and message passing.
- **Message Passing**: Alan Kay introduced the idea of message passing between objects, where objects communicate with each other by sending messages rather than calling methods directly.
- **Encapsulation and Inheritance**: His work promoted the encapsulation of data and behavior within objects, along with the ability to extend existing behavior via inheritance.

### Legacy

Alan Kay’s contributions have shaped modern software development and influenced many popular programming languages like Java, Python, C++, and Ruby, all of which adopt OOP principles in one form or another.

### Recommended Courses

To deepen your understanding of OOP concepts and their applications, consider enrolling in the following courses from DesignGurus.io:

- [Grokking Data Structures & Algorithms for Coding Interviews](https://www.designgurus.io/course/grokking-data-structures-for-coding-interviews)
- [Grokking the Coding Interview: Patterns for Coding Questions](https://www.designgurus.io/course/grokking-the-coding-interview)
- [Grokking the System Design Interview](https://www.designgurus.io/course/grokking-the-system-design-interview)

These courses will help you understand the foundational concepts of OOP and prepare you for technical interviews in software development.

Who is the father of OOPs?

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The father of Object-Oriented Programming (OOP) is Alan Kay. Alan Kay is widely recognized for his pioneering work on the development of OOP concepts. He was instrumental in the creation of the programming language Smalltalk, which was one of the first programming languages to fully embrace OOP principles.

Kay’s vision for OOP was influenced by his work on the Dynabook concept, an early idea for a portable personal computer, which emphasized the need for flexible, user-centered computing systems. He saw OOP as a way to better model and represent complex systems, using "objects" to simulate real-world entities that could interact in a modular, reusable way.

While other early contributions to OOP were made by various individuals (such as Simula, a language developed by Ole-Johan Dahl and Kristen Nygaard), Alan Kay’s work in the 1970s laid the foundation for OOP as we know it today.