from Gladys, Yohana and Mariana

Alfredo Hinojosa is a Mexican Immigrant who came to United States twenty years ego.

Ego should be "ago."


Immigrant is not a name, so the first i should not be capital. It should be "immigrant."

When the name of a country is more than one word, there is usually "the" before it.

The United States

The Republic of South Korea

The United Kingdom


Alfredo Hinojosa is a Mexican immigrant who came to the United States twenty years ago.


His first job was Farmer Worker.

It should be "farm worker," and because it is not a name it should have no capital letters.


His first job was farm worker.



He studied English in a Community College,


That is a complete sentence. It should end with a period (.), not a comma (.)


Community College is a type of college, not the name of a particular college, so it should have no capital letters (community college).



He studied English in a community college.


after that Alfredo started to study Medicine in Harvard Medical School.


This is a complete sentence. It should begin with a capital letter

There should be a comma before "Alfredo."


"Medicine' is not a name, so there should not be a capital letter (medicine is correct).




After that, Alfredo started to study medicine in Harvard Medical School.



Alfredo Hinojosa, who is profesor in the University of California, is looking for a breakthrough in the treatment of brain Cancer.

Excellent construction.

"profesor" is misspelled. (professor)

There should be an indirect object (a or an) before professor (a professor)



Alfredo Hinojosa, who is a professor in the University of California, is looking for a breakthrough in the treatment of cancer.



Alfredo says he owes so much of his success to the many people who have extended a hand to him throughout his life.


That's correct.