<prompt> Human: So I was just given an offer letter from the President of the company which specializes in heavy duty wasteoil operations in Houston. I previously worked for the company for roughly 4 years and left making around 55k. Well the new offer has me possibly maxing out at 40k not including overtime which there is a lot of. I talked to the person who would be my supervisor about how I made more money when I first started last time and told him how much I was making when I left. His response was well after your first 90 days we can for sure reevaluate and go from there. Was not sure if I should negotiate the salary terms with him, the President or the HR Manager since all three were included on the email with the offer.My question: What would be the best way to go in negotiating better pay or should I prove myself once again and hope that my pay will actually be renegotiated after the first 90 days?Additional background: Currently employed at a Petroleum transport company making roughly 50k. Daily commute is 60 miles and the work is very dull compared to the other company which is 25 mile daily commute and great work atmosphere and enjoyable work.Thanks for all the help and look forward to everyones responses!  <response>: I left a company awhile ago for a year, then they asked me to come back. My salary was the same as when I left because the positionwork was exactly the same. There was no need to prove myself as there was ample history of my performance.Does the company keep records of performancereviews? Will you be doing the same work, or be in the same position as before? Did the offer come from HR? I assume they have an HR department. 