This user considers "he or she" to be more appropriate in formal English; however, the singular they deserves recognition as a less awkward gender-neutral pronoun.
Alex rosenberg35 is a computer scientist and systems administrator. Although this user always tries his best to improve Wikipedia content, this user is a mere human and is therefore susceptible to human error. If you think you have found such case, feel free to correct it and/or leave a message on this user's talk page.