How do you find the owner of a group through a script?

Hello, Kev!

Have you heard about GetGroupInfoAsync function?

This should help you:

local groupId = 0
local group = game:GetService("GroupService"):GetGroupInfoAsync(groupId)

local owner = group.Owner
local ownerName = owner.Name
local ownerUID = owner.Id

print(group.Name .. "'s owner name is " .. ownerName .. " and his UserId is " .. ownerUID)

local groupid = 1 --put your group id here
game.Players.PlayerAdded:Connect(function(player)
    if player:GetRankInGroup(groupid) == 255 then
        print("The owner of the group has joined the game")
    print("Owner: "..plr.Name)
    print("Owner's UserId: "..plr.Name
    else
        print("A player has joined the game")
    end
end)

The highest rank in a group is rank 255 (aka the rank of the group owner). We check if the player who joined is the owner of the group by checking his in a certain group.

Incapaz said that :GetRankInGroup() caches, I do not think that is true but if it really does you can use http://wiki.roblox.com/index.php?title=API:Class/GroupService/GetGroupInfoAsync