On your first day, it's easy to get overwhelmed with all the new names and faces, but it's important to introduce yourself to every person you run into. From the administrative assistant who greets you to the HR rep who makes your name badge to the company CEO you bump into in the hallway, you never know who exactly you'll be working or collaborating with on a daily basis. Introduce yourself to each person you meet, and try to get a sense of who they are and what they do in the company. (If you need to, make a cheat sheet and keep track of who's who and where their office is located.) To help yourself remember their names, try to use it 2 or 3 times in conversation.