#### Solution By Steps

***Step 1: Identify the First Summer Olympics After WW2***

The first Summer Olympics after World War II were held in London in 1948.

***Step 2: List Some Event Winners***

Some event winners at the 1948 London Olympics were Fanny Blankers-Koen (Netherlands) in athletics, Micheline Ostermeyer (France) in athletics and music, and Jan Brzak (Czechoslovakia) in gymnastics.

***Step 3: Determine the Athletes with the Most Gold Medals***

- The athlete with the most gold medals at the 1948 London Olympics was Fanny Blankers-Koen from the Netherlands.

- The athlete with the second most gold medals was Micheline Ostermeyer from France.

- The athlete with the third most gold medals was Jan Brzak from Czechoslovakia.

#### Final Answer

Most Gold Medals: Fanny Blankers-Koen (Netherlands)

2nd Most Gold Medals: Micheline Ostermeyer (France)

3rd Most Gold Medals: Jan Brzak (Czechoslovakia)

#### Key Concept

1948 London Olympics Winners

#### Key Concept Explanation

The 1948 London Olympics marked the first Summer Olympics after World War II. Fanny Blankers-Koen, Micheline Ostermeyer, and Jan Brzak were notable event winners, with Fanny Blankers-Koen securing the most gold medals, followed by Micheline Ostermeyer and Jan Brzak.