looking for a plaster professional

We have noticed that our ceiling started cracking in some areas possibly due to the incorrect prep work from previous jobs. Our coop is built in the 50s and possibly has some lead paint. Now that we are expecting, I’m concerned about lead exposure and would appreciate recommendations of EPA certified contractors you’ve worked with to do the skim coating for our 2 br apartment. If you were happy with your contractor, please share their information; if you had horrible experience with someone, we’d appreciate knowing who to avoid as well. Any information would be helpful. Thank you!