Approach controller reported another controller climbed an aircraft into their airspace without coor...

Attributes
ACN	1659605
Time
Date	201906
Local Time Of Day	0001-0600
Place
Locale Reference	C90.TRACON
State Reference	IL
Aircraft 1
Make Model Name	Medium Transport
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	Direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 6.0
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Conflict NMAC Deviation - Procedural Published Material / Policy

Narrative:

The south departure controller climbed their aircraft Y to 15;000' right into my aircraft X who was in my arrival corridor; airspace that I own 7;000' and above. Because of the vast airspace I was looking at; the tags were overlapped and I didn't see that aircraft Y was climbing through 5;000' (standard departure altitude off ord) and wasn't aware of this until aircraft X reported responding to an RA.we're working a lot of overtime every week; but people need to pay attention more. These planes were pointed right at each other and it makes me uneasy when there's so little going on and someone creates a situation in which TCAS basically saves a near mid-air. I don't know if it was because it's their 6th day; it's an early shift or a combination of both; that person needs to not be working planes if they're so tired or out of it that something like this can happen.

Original NASA ASRS Text

Title: Approach Controller reported another Controller climbed an aircraft into their airspace without coordination causing an NMAC.

Narrative: The South Departure Controller climbed their Aircraft Y to 15;000' right into my Aircraft X who was in my arrival corridor; airspace that I own 7;000' and above. Because of the vast airspace I was looking at; the tags were overlapped and I didn't see that Aircraft Y was climbing through 5;000' (standard departure altitude off ORD) and wasn't aware of this until Aircraft X reported responding to an RA.We're working a lot of overtime every week; but people need to pay attention more. These planes were pointed right at each other and it makes me uneasy when there's so little going on and someone creates a situation in which TCAS basically saves a near mid-air. I don't know if it was because it's their 6th day; it's an early shift or a combination of both; that person needs to not be working planes if they're so tired or out of it that something like this can happen.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Approach controller reported another controller climbed an aircraft into their airspace without coordination causing an near midair collision.