Do you believe,it is possible for a person to create a completely different/tough personality to assist them in performing their chosen profession?

Years ago,I had a friend,her father was the nicest guy you could ever meet.
This guy would do anything for anyone,he was always willing to help,he worked as a correctional officer.
I was told at work,he was a total A-hole and was often cited and almost fired numerous times for unnecessary roughness.

Howard Stern has stated,in real life,he is really nice guy and his on air insensitive,disrespectful persona is just an act .

I’ve met a 21 year old girl,she does XXX films,countless scenes with several men at once but she claims in real life,she’s very shy and quite timid.
Her current boyfriend;she met him at her church’s singles mixer,she did not kissed him ‘til the 3rd date,they became intimate after a month and a half of dating and she is a one man woman and would never ever cheat on him ??!!??

Do you believe these: “for work only”,alternative personas are possible or just BS and/or just deep denial !