diff --git a/src/pair_dpd.h b/src/pair_dpd.h
index 2237ae6fdd..0784eefb6c 100644
--- a/src/pair_dpd.h
+++ b/src/pair_dpd.h
@@ -27,19 +27,19 @@ namespace LAMMPS_NS {
 class PairDPD : public Pair {
  public:
   PairDPD(class LAMMPS *);
-  ~PairDPD();
-  void compute(int, int);
-  void settings(int, char **);
-  void coeff(int, char **);
+  virtual ~PairDPD();
+  virtual void compute(int, int);
+  virtual void settings(int, char **);
+  virtual void coeff(int, char **);
   void init_style();
   double init_one(int, int);
   void write_restart(FILE *);
   void read_restart(FILE *);
-  void write_restart_settings(FILE *);
-  void read_restart_settings(FILE *);
+  virtual void write_restart_settings(FILE *);
+  virtual void read_restart_settings(FILE *);
   double single(int, int, int, int, double, double, double, double &);
 
- private:
+ protected:
   double cut_global,temperature;
   int seed;
   double **cut;
diff --git a/src/pair_dpd_tstat.cpp b/src/pair_dpd_tstat.cpp
new file mode 100644
index 0000000000..83f7488c6c
--- /dev/null
+++ b/src/pair_dpd_tstat.cpp
@@ -0,0 +1,245 @@
+/* ----------------------------------------------------------------------
+   LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
+   http://lammps.sandia.gov, Sandia National Laboratories
+   Steve Plimpton, sjplimp@sandia.gov
+
+   Copyright (2003) Sandia Corporation.  Under the terms of Contract
+   DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
+   certain rights in this software.  This software is distributed under 
+   the GNU General Public License.
+
+   See the README file in the top-level LAMMPS directory.
+------------------------------------------------------------------------- */
+
+#include "math.h"
+#include "pair_dpd_tstat.h"
+#include "atom.h"
+#include "update.h"
+#include "force.h"
+#include "neigh_list.h"
+#include "comm.h"
+#include "random_mars.h"
+#include "error.h"
+
+using namespace LAMMPS_NS;
+
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+#define MAX(a,b) ((a) > (b) ? (a) : (b))
+
+#define EPSILON 1.0e-10
+
+/* ---------------------------------------------------------------------- */
+
+PairDPDTstat::PairDPDTstat(LAMMPS *lmp) : PairDPD(lmp)
+{
+  single_enable = 0;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void PairDPDTstat::compute(int eflag, int vflag)
+{
+  int i,j,ii,jj,inum,jnum,itype,jtype;
+  double xtmp,ytmp,ztmp,delx,dely,delz,fpair;
+  double vxtmp,vytmp,vztmp,delvx,delvy,delvz;
+  double rsq,r,rinv,dot,wd,randnum,factor_dpd;
+  int *ilist,*jlist,*numneigh,**firstneigh;
+
+  if (eflag || vflag) ev_setup(eflag,vflag);
+  else evflag = vflag_fdotr = 0;
+
+  // adjust sigma if target T is changing
+
+  if (t_start != t_stop) {
+    double delta = update->ntimestep - update->beginstep;
+    delta /= update->endstep - update->beginstep;
+    temperature = t_start + delta * (t_stop-t_start);
+    double boltz = force->boltz;
+    for (i = 1; i <= atom->ntypes; i++)
+      for (j = i+1; j <= atom->ntypes; j++)
+	sigma[i][j] = sigma[j][i] = sqrt(2.0*boltz*temperature*gamma[i][j]);
+  }
+
+  double **x = atom->x;
+  double **v = atom->v;
+  double **f = atom->f;
+  int *type = atom->type;
+  int nlocal = atom->nlocal;
+  int nall = nlocal + atom->nghost;
+  double *special_lj = force->special_lj;
+  int newton_pair = force->newton_pair;
+  double dtinvsqrt = 1.0/sqrt(update->dt);
+
+  inum = list->inum;
+  ilist = list->ilist;
+  numneigh = list->numneigh;
+  firstneigh = list->firstneigh;
+  
+  // loop over neighbors of my atoms
+
+  for (ii = 0; ii < inum; ii++) {
+    i = ilist[ii];
+    xtmp = x[i][0];
+    ytmp = x[i][1];
+    ztmp = x[i][2];
+    vxtmp = v[i][0];
+    vytmp = v[i][1];
+    vztmp = v[i][2];
+    itype = type[i];
+    jlist = firstneigh[i];
+    jnum = numneigh[i];
+
+    for (jj = 0; jj < jnum; jj++) {
+      j = jlist[jj];
+
+      if (j < nall) factor_dpd = 1.0;
+      else {
+	factor_dpd = special_lj[j/nall];
+	j %= nall;
+      }
+
+      delx = xtmp - x[j][0];
+      dely = ytmp - x[j][1];
+      delz = ztmp - x[j][2];
+      rsq = delx*delx + dely*dely + delz*delz;
+      jtype = type[j];
+
+      if (rsq < cutsq[itype][jtype]) {
+	r = sqrt(rsq);
+	if (r < EPSILON) continue;     // r can be 0.0 in DPD systems
+	rinv = 1.0/r;
+	delvx = vxtmp - v[j][0];
+	delvy = vytmp - v[j][1];
+	delvz = vztmp - v[j][2];
+	dot = delx*delvx + dely*delvy + delz*delvz;
+	wd = 1.0 - r/cut[itype][jtype];
+	randnum = random->gaussian();
+
+	// drag force = -gamma * wd^2 * (delx dot delv) / r
+	// random force = sigma * wd * rnd * dtinvsqrt;
+
+	fpair = gamma[itype][jtype]*wd*wd*dot*rinv;
+	fpair += sigma[itype][jtype]*wd*randnum*dtinvsqrt;
+	fpair *= factor_dpd*rinv;	
+
+	f[i][0] += delx*fpair;
+	f[i][1] += dely*fpair;
+	f[i][2] += delz*fpair;
+	if (newton_pair || j < nlocal) {
+	  f[j][0] -= delx*fpair;
+	  f[j][1] -= dely*fpair;
+	  f[j][2] -= delz*fpair;
+	}
+
+	if (evflag) ev_tally(i,j,nlocal,newton_pair,
+			     0.0,0.0,fpair,delx,dely,delz);
+      }
+    }
+  }
+
+  if (vflag_fdotr) virial_compute();
+}
+
+/* ----------------------------------------------------------------------
+   global settings 
+------------------------------------------------------------------------- */
+
+void PairDPDTstat::settings(int narg, char **arg)
+{
+  if (narg != 4) error->all("Illegal pair_style command");
+
+  t_start = force->numeric(arg[0]);
+  t_stop = force->numeric(arg[1]);
+  cut_global = force->numeric(arg[2]);
+  seed = force->inumeric(arg[3]);
+
+  temperature = t_start;
+
+  // initialize Marsaglia RNG with processor-unique seed
+
+  if (seed <= 0) error->all("Illegal pair_style command");
+  delete random;
+  random = new RanMars(lmp,seed + comm->me);
+
+  // reset cutoffs that have been explicitly set
+
+  if (allocated) {
+    int i,j;
+    for (i = 1; i <= atom->ntypes; i++)
+      for (j = i+1; j <= atom->ntypes; j++)
+	if (setflag[i][j]) cut[i][j] = cut_global;
+  }
+}
+
+/* ----------------------------------------------------------------------
+   set coeffs for one or more type pairs
+------------------------------------------------------------------------- */
+
+void PairDPDTstat::coeff(int narg, char **arg)
+{
+  if (narg < 3 || narg > 4) error->all("Incorrect args for pair coefficients");
+  if (!allocated) allocate();
+
+  int ilo,ihi,jlo,jhi;
+  force->bounds(arg[0],atom->ntypes,ilo,ihi);
+  force->bounds(arg[1],atom->ntypes,jlo,jhi);
+
+  double a0_one = 0.0;
+  double gamma_one = force->numeric(arg[2]);
+
+  double cut_one = cut_global;
+  if (narg == 4) cut_one = force->numeric(arg[3]);
+
+  int count = 0;
+  for (int i = ilo; i <= ihi; i++) {
+    for (int j = MAX(jlo,i); j <= jhi; j++) {
+      a0[i][j] = a0_one;
+      gamma[i][j] = gamma_one;
+      cut[i][j] = cut_one;
+      setflag[i][j] = 1;
+      count++;
+    }
+  }
+
+  if (count == 0) error->all("Incorrect args for pair coefficients");
+}
+
+/* ----------------------------------------------------------------------
+   proc 0 writes to restart file
+------------------------------------------------------------------------- */
+
+void PairDPDTstat::write_restart_settings(FILE *fp)
+{
+  fwrite(&t_start,sizeof(double),1,fp);
+  fwrite(&t_stop,sizeof(double),1,fp);
+  fwrite(&cut_global,sizeof(double),1,fp);
+  fwrite(&seed,sizeof(int),1,fp);
+  fwrite(&mix_flag,sizeof(int),1,fp);
+}
+
+/* ----------------------------------------------------------------------
+   proc 0 reads from restart file, bcasts
+------------------------------------------------------------------------- */
+
+void PairDPDTstat::read_restart_settings(FILE *fp)
+{
+  if (comm->me == 0) {
+    fread(&t_start,sizeof(double),1,fp);
+    fread(&t_stop,sizeof(double),1,fp);
+    fread(&cut_global,sizeof(double),1,fp);
+    fread(&seed,sizeof(int),1,fp);
+    fread(&mix_flag,sizeof(int),1,fp);
+  }
+  MPI_Bcast(&t_start,1,MPI_DOUBLE,0,world);
+  MPI_Bcast(&t_stop,1,MPI_DOUBLE,0,world);
+  MPI_Bcast(&cut_global,1,MPI_DOUBLE,0,world);
+  MPI_Bcast(&seed,1,MPI_INT,0,world);
+  MPI_Bcast(&mix_flag,1,MPI_INT,0,world);
+
+  // initialize Marsaglia RNG with processor-unique seed
+  // same seed that pair_style command initially specified
+
+  if (random) delete random;
+  random = new RanMars(lmp,seed + comm->me);
+}
+
diff --git a/src/pair_dpd_tstat.h b/src/pair_dpd_tstat.h
new file mode 100644
index 0000000000..f50ddcaa67
--- /dev/null
+++ b/src/pair_dpd_tstat.h
@@ -0,0 +1,44 @@
+/* ----------------------------------------------------------------------
+   LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
+   http://lammps.sandia.gov, Sandia National Laboratories
+   Steve Plimpton, sjplimp@sandia.gov
+
+   Copyright (2003) Sandia Corporation.  Under the terms of Contract
+   DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
+   certain rights in this software.  This software is distributed under 
+   the GNU General Public License.
+
+   See the README file in the top-level LAMMPS directory.
+------------------------------------------------------------------------- */
+
+#ifdef PAIR_CLASS
+
+PairStyle(dpd/tstat,PairDPDTstat)
+
+#else
+
+#ifndef LMP_PAIR_DPD_TSTAT_H
+#define LMP_PAIR_DPD_TSTAT_H
+
+#include "pair_dpd.h"
+
+namespace LAMMPS_NS {
+
+class PairDPDTstat : public PairDPD {
+ public:
+  PairDPDTstat(class LAMMPS *);
+  ~PairDPDTstat() {}
+  void compute(int, int);
+  void settings(int, char **);
+  void coeff(int, char **);
+  void write_restart_settings(FILE *);
+  void read_restart_settings(FILE *);
+
+ private:
+  double t_start,t_stop;
+};
+
+}
+
+#endif
+#endif