Curran and Seaton

Their theory was that the media is fuelled by money and power and that the companies only care about these two things.

Because of this, the media can often be limited to what they produce as they're worried about venturing out of their normal situation and then in result not making enough money.

Stuart Hall

Stuart Hall is known as a cultural theorist who came up with the theory of how the audience perceive things.
The first way is preferred reading. This is how the creator wants the media to be viewed by the audience.
The second way is negotiated reading. This is when the audience partly adapts the media in their head to help believe it is what they think, but they also broadly accept the preferred reading. 
The last way is called oppositional reading. This is when the audience completely reject the preferred reading and interpret it in their own way as an individual.   

Albert Bandura

Albert Bandura is a psychologist born in 1925. He came up with a theory called the 'Hypodermic syringe model' which is a theory that represents how the media can indoctrinate people directly. 
it describes how the media can directly insert a message into somebody's mind and they will happily except that to be correct. Some examples of this model was shown in Nazi propaganda during World War 2 to make people believe that the minorities were not as good as the aryans etc. 
It brings the idea forward that the media can be very powerful in getting their intended messages - good or bad - directly into our thoughts and perceptions.

Roland Barthes

Roland Barthes is one of the leading theorists in semiotics - the study of signs and symbols and what they mean/imply. 
In his theory he stated that he believes every sign/symbol/word has two essential things; denotations and connotations. 
A denotation is something that you see when you look at something and a connotation is something you understand from it (hidden meanings). He believed that everything has both of these because there are always hidden meanings in life and everything it contains.  

Stephen Neale

Stephen Neale is a media theorist who defined genre through repetition and difference and he stated that genre should be recognised easily through clear conventions.
The repetition side of his definition is that in films and TV etc. for certain genres, the same props, settings, acting styles for example help people to recognise the genre very quickly. As an example, horror movies will always include an eerie setting, jump scares, a group of culturally and intellectually different individuals alongside tense music throughout. People would instantly be able to recognise a horror film because the conventions are clear and would know what to expect from possible past experiences. 
The difference side of it however, is when a production company adds new and different things to make it seem more interesting and not like a clone of all the others.