There is a bitcointalk user
katie1348 who was last active on this forum on January 15
In their signature line, they've indicated that they accept tips at the address 1kTavPZ5c1G8gDFHEmSimSDFVkG4mybLs
On January 14 (or January 15 depending on your timezone) the person that controls the address 1CsdwuSV6vnMM8Bv4ngMS5aWf5zAUhjF4k sent katie1348 exactly 0.0101 BTC in the following transaction:
https://blockchain.info/tx/4d1e41bb3890a3beae3f3145a74f9f07766b03921fe8eb389c7e9c724b5c53fdPerhaps you can send katie1348 a PM and ask them if they know who they received the 0.0101 BTC from on that date? If they do, then they can tell you who owns that address.
There is a bitcointalk user
Porte who was last active on this forum on February 18
In the following post, they've indicated that they control the address 1Lk5Paws9T1YpoSeLeZT7ZeSQKW7UNq4TJ:
https://bitcointalk.org/index.php?topic=450200.msg5188367#msg5188367On February 16 the person that controls the address 1CsdwuSV6vnMM8Bv4ngMS5aWf5zAUhjF4k sent Porte exactly 0.075 BTC in the following transaction:
https://blockchain.info/tx/d252a1ab3a0edd7e44c83a81ebcc7c9c3cc02f96fb9d30875ae72333ee40c1d5Perhaps you can send Porte a PM and ask them if they know who they received the 0.075 BTC from on that date? If they do, then they can tell you who owns that address.
The controller of 1CsdwuSV6vnMM8Bv4ngMS5aWf5zAUhjF4k frequently sends bitcoins to the address 1MvaQ3Lr86Y1ShmicbP5DefLH81cHhFm4q (18 times so far), and they are the ONLY person who has ever (so far) sent bitcoins to the 1MvaQ3Lr86Y1ShmicbP5DefLH81cHhFm4q address. Each time bitcoins are received at the 1MvaQ3Lr86Y1ShmicbP5DefLH81cHhFm4q, they are later spent from there. If I had to guess, I'd say that 1MvaQ3Lr86Y1ShmicbP5DefLH81cHhFm4q belongs to either a second wallet that is controlled by the same person as 1CsdwuSV6vnMM8Bv4ngMS5aWf5zAUhjF4k, or is a funding address for some online service. Either way, if you can figure out who controls 1MvaQ3Lr86Y1ShmicbP5DefLH81cHhFm4q you'll probably be able to figure out who controlls 1CsdwuSV6vnMM8Bv4ngMS5aWf5zAUhjF4k.
Good luck in your search. That's all I have time for at the moment. Let us know if you manage to figure it out.